Which option correctly describes the pattern of valence electrons on the periodic table?

A.The number of valence electrons increases from bottom to top.
B.The number of valence electrons increases from top to bottom.
C.The number of valence electrons increases from right to left.
D.The number of valence electrons increases from left to right.

The number of valence electrons in each of the atoms are;

B - 3

Al - 3

Cl - 7

Ne - 8

We define an atom as the smallest part of a substance that can take part in a chemical reaction. We know that when we begin to break down the elements that the atoms can be found in the element and there are sub atomic particles that can also be found inside the atom of the element.

The electrons that are found at the last shell or the outermost shell of the atom are the ones that we call the valence electrons that can be found in the atom.

The electronic configuration of boron is \(1s^2 2s^2 2p^1\) (the n =2 level is the valence shell)

The electronic configuration of Al is \(1s^2 2s^2 2p^6 3s^2 3p^1\)( the n= 3level is the valence shell)

The electron configuration of Cl is \(1s^2 2s^2 sp^6 3s^23p^5\) ( the n= 3level is the valence shell)

The electron configuration of Ne is \(1s^2 2s^2 2p^6\) (the n =2 level is the valence shell)

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Answer: 5 and 11

Explanation:

protons= 5

neutrons=6

mass number= 6+5=11

To determine the number of moles of hydrogen needed to crack one mole of the long saturated hydrocarbon chain (C40H82), we can analyze the reactants and products involved in the cracking reaction.

The cracking reaction is given as: C40H82 -> 3 C8H18 + n C2H6. From the equation, we can see that one mole of the long hydrocarbon chain (C40H82) produces three moles of octane (C8H18) and n moles of ethane (C2H6). Since the cracking process involves breaking the carbon-carbon bonds and forming new carbon-hydrogen bonds, the number of hydrogen atoms in the products should remain the same as in the reactant.

The long hydrocarbon chain (C40H82) contains 82 hydrogen atoms, and the products, 3 moles of octane (C8H18), contain (3 moles) * (18 hydrogen atoms/mole) = 54 hydrogen atoms. Therefore, the number of moles of hydrogen needed for cracking one mole of the long hydrocarbon chain can be calculated as: Number of moles of hydrogen = 82 - 54 = 28 moles. Hence, 28 moles of hydrogen are required to crack one mole of the long saturated hydrocarbon chain (C40H82).

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To calculate the amount of money you would spend on gas in one week while driving 113 km per day in Europe,  gas costs we need to convert the given values and perform some calculations.

1 km = 0.621371 miles

So, 113 km is approximately equal to 70.21 miles (113 km * 0.621371).

Miles per gallon (mpg) = 28.0 mi/gal

Miles driven per week = 70.21 mi/day * 7 days = 491.47 miles/week

Gallons consumed per week = Miles driven per week / Miles per gallon = 491.47 mi/week / 28.0 mi/gal ≈ 17.55 gallons/week

1 euro = 1.26 dollars

Cost per gallon = 1.10 euros/gallon * 1.26 dollars/euro = 1.386 dollars/gallon

Total cost per week = Cost per gallon * Gallons consumed per week = 1.386 dollars/gallon * 17.55 gallons/week ≈ 24.33 dollars/week

Therefore, if gas costs 1.10 euros per liter, and your car's gas mileage is 28.0 mi/gal, you would spend approximately 24.33 dollars on gas in one week while driving 113 km per day in Europe.

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Answer: surface temperature

Explanation:

Answer:

It is in the periodic table, group 9 with the atomic number 7

it's a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei.

To two decimal places, the imaginary element's approximate atomic mass is 212.47 g/mol.

The identical unit cells are defined in such a way that they fill space without overlapping. A crystal lattice is the three-dimensional arrangement of atoms, molecules, or ions within a crystal.It is composed of multiple unit cells. Every lattice point is occupied by one of the three component particles.

For a face-centered cubic (FCC) lattice, the number of atoms per unit cell (Z) is 4. The density of the element can be related to its atomic mass (M) using the equation:

density = Z × M / (Na × a³)

where Na is Avogadro's constant and a is the edge length of the unit cell.

Rearranging this equation to solve for the atomic mass, we get:

M = density × Na × a³ / (Z)

Substituting the given values, we get:

M = (2.47 g/cm³) × (6.022 × 10²³ mol⁻¹) × (7.17 × 10⁻⁸ cm)³ / 4 = 212.47 g/mol

Therefore, the approximate atomic mass of the imaginary element is 212.47 g/mol, to 2 decimal places.

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The formulas in a chemical equation represent the different compounds or molecules involved in the reaction. The arrow indicates the direction of the reaction, usually pointing from the reactants to the products.

In a chemical equation, the formulas, arrow, and plus signs convey important information about the chemical reaction taking place. The plus signs indicate that multiple reactants or products are present.

1. Formulas: These represent the chemical compounds involved in the reaction, with each formula showing the elements and their proportions in the compound. The formulas on the left side of the equation are the reactants, and those on the right side are the products.

2. Arrow: The arrow in the equation (→) represents the direction of the reaction, indicating that the reactants on the left side are converted into the products on the right side. It can be read as "yields" or "forms."

3. Plus signs: These denote that two or more reactants or products are involved in the reaction. A plus sign between reactants or products indicates they are separate entities participating in or resulting from the chemical reaction.

In summary, the formulas, arrow, and plus signs in a chemical equation describe the reactants, products, and the process of the chemical reaction taking place.

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Answer:

121 million joules energy is released

Explain :

As there are 500 moles of hydrogen gas in a kilogram, this means that burning a kilogram of hydrogen gas releases 500 times as much energy or 121 million joules .

C is the answer ok

u dont need to know

Answer:

quartz (SiO2)n

Explanation:

Melting point is defined as the temperature or point at which the substances change its state from solid to liquid.

Quartz (SiO2)n has high melting point than O2 because Quartz (SiO2)n is found in the form of hard, crystalline mineral that is made up of silicon and oxygen atoms having strong covalent bonds between all the atoms. So, a lot of energy is required to break the bond between the atoms and it has a high melting point.

Hence, the correct answer is quartz (SiO2)n.

Explanation:

A mixture is made of two or more substances that are not chemically combined whereas a compound is made of 2 or more elements that are chemically combined. The elements that make up the compound are combined in fixed ratios.

Answer:

60%

Explanation:

En la reacción:

2SO₂ + O₂ → 2SO₃

Donde 2 moles de SO₂ reaccionan por mol de O₂.

El peso atómico del SO₂ es:

1S = 32g/molₓ1 = 32g/mol

2O = 16g/molₓ2 = 32g/mol

SO₂ = 32g/mol + 32g/mol = 64g/mol

Y el peso atómico de O₂ es:

2O = 16g/molₓ2 = 32g/mol

Las moles de SO₂ y O₂ son:

SO₂: 40g ₓ (1mol / 64g) = 0.625 moles

O₂: 25g ₓ (1mol / 32g) = 0.7813 moles

Para una completa reacción de SO₂ se necesitan:

0.625 moles SO₂ ₓ (1mol O₂ / 2 mol SO₂) = 0.3125 moles de O₂

Así, las moles en exceso de O₂ son:

0.7813 moles - 0.3125 moles = 0.4688 moles O₂

En gramos:

0.4688 moles O₂ ₓ (32g / mol) = 15g O₂ están en exeso.

El porcentaje en exceso es:

15g / 25g ₓ 100 =

The absence of a positive indication signifies that the system's compressor was functional. As a result, the compressor's work is 15.0 Kcal.

The system loses energy when the corresponding PV work has a negative sign. The work performed by the system is negative if the volume grows at constant pressure (V > 0), which shows that the system has expended energy by working on its surroundings.

The heat extracted from the freezer less the heat discharged via the condenser is the work done by the compressor:

work = heat removed - heat released

= 40.0 Kcal - 55.0 Kcal

= -15.0 Kcal.

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No, the amount given to the policeman at the end of his 10-hour shift, which is 0.4 kg, is not the correct amount based on the payment rate of 1 mole per hour.

To determine if the amount is correct, we need to convert the given mass of 0.4 kg to moles using the molar mass of calcium [40 Ca].

The molar mass of calcium is approximately 40.08 g/mol. Since the atomic mass of calcium is close to 40 g/mol, we can assume that the given molar mass refers to calcium-40, denoted as [40 Ca].

To convert the mass to moles, we can use the formula:

moles = mass (in grams) / molar mass

moles = 0.4 kg * 1000 g/kg / 40.08 g/mol

moles ≈ 9.98 mol

Therefore, the amount of calcium [40 Ca] the policeman received after his 10-hour shift is approximately 9.98 moles, not 1 mole per hour as stated in the payment rate.

Thus, the amount given to him is significantly higher than the correct amount. It appears there may have been an error in the payment calculation or a misunderstanding regarding the payment rate.

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The statement of fact is that Gregor Mendel demonstrated that traits are passed from parents to offspring independently of one another under all circumstances that he tested.

The independent assortment of genes is the theory that states that traits are inherited from parents by offspring independent of each other.

Gregor Mendel from experiments using pea plants was able to demonstrate this observation by many scientists.

Since, scientific theories are proven by experiments, Mendel's experiments provided facts for this observation.

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Answer:

They must be detailed enough that another scientist can repeat exactly what you did and know if they are getting the same data. ... To make sure that data can be reproduced by other people and other laboratories. Also so that you know exactly what is there and to know you arn't missing anything. ~ Hope this helps :>

Explanation:

Answer:

16

Explanation:

Answer:

16 hopes this will help you

Explanation:

16 hope this helps

According to Le Chatelier's principle, if the volume of a sealed vessel is decreased while the temperature is kept constant, the equilibrium will shift in a direction that reduces the overall pressure of the system.

This can be explained by the fact that when the volume of a sealed vessel is decreased, the number of molecules in the vessel becomes higher, which increases the pressure inside the vessel. To reduce the pressure, the system will shift in the direction that has fewer moles of gas.

For example, if a reaction involves more moles of gas on the product side, then the equilibrium will shift to the reactant side to reduce the pressure. Conversely, if the reaction involves more moles of gas on the reactant side, then the equilibrium will shift to the product side to reduce the pressure.

In summary, decreasing the volume of a sealed vessel while keeping the temperature constant will cause the equilibrium to shift in the direction that reduces the overall pressure of the system, according to Le Chatelier's principle.

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The correct way to set up the relationship between milligrams and grams is 1mg-10-³g. option D is correct.

The milligrams and grams are is eual to the 1g = 1,000mg. 1,000 milligrams (mg) in 1 gram (g).

The conversion of  your gram figure to milligrams multiply your figure by 1000.  1mg is 1/1000g. There are 1,000 milligrams in 1 gram.

Therefore, The correct way to set up the relationship between milligrams and grams is 1mg-10-³g. option D is correct.

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Answer:

a. 208g Bi

c. 0.0400g He

e. 2.38g U

b. 9.12g Mn

d. 1.40g N

Explanation:

I apologize in advance if any are incorrect. Hopefully this helps.

Answer:

phosphorous(iii) oxide

Explanation:

Hope this helps! :)

Answer:

Average atomic mass of uranium = 237.97 amu

Explanation:

Given data:

Abundance of U-234 = 0.01%

Abundance of U-235 = 0.71%

Abundance of U-238 = 99.28%

Average atomic mass of uranium = ?

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass)  / 100

Average atomic mass  = (234×0.01)+(235×0.71)+(238+99.28) /100

Average atomic mass =  2.34 + 166.85+23628.64 / 100

Average atomic mass = 23797.83 / 100

Average atomic mass = 237.97 amu.

Answer:

A net ionic equation shows only the chemical species that are involved in a reaction, while a complete ionic equation also includes the spectator ions.

Brainlist pls!

The location of an element can provide information about its Properties, Valence electrons, and Category in the periodic table. The periodic table is the table of elements that are organized by increasing atomic number. The rows of the periodic table are called periods, and the columns of the periodic table are called groups or families.

Each element in the periodic table has a unique atomic number, and this number determines its placement on the table.Based on the position of an element in the periodic table, one can make certain predictions about its properties and behavior. For instance, the location of an element in the periodic table can help predict the number of valence electrons it has. Valence electrons are the electrons found in the outermost shell of an atom, and they are responsible for the chemical behavior of an element. The number of valence electrons an element has determines its reactivity and the types of chemical bonds it can form with other elements.

Moreover, an element’s position in the periodic table provides information about its properties such as whether it is a metal, nonmetal or metalloid. Metalloids, for example, are elements found along the diagonal line between the metals and nonmetals in the periodic table. Metalloids have properties that are intermediate between metals and nonmetals. For example, they may be shiny like metals but not as malleable or ductile. Some common metalloids include boron, silicon, and germanium.In conclusion, an element's location in the periodic table can provide information about its properties, valence electrons, and category in the periodic table.

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The specific heat capacity of water is 4.18 J/ °C g. 1500 ml of water is 1500 g thus the enthalpy change for a temperature difference of 24.2 to 25.9 degree Celsius is 10659 per mole or 1065.9 for 0.1 mol.

Calorimetry is an analytical tool used to determine the enthalpy change of a reaction. The calorimetric equation connecting the mass, temperature difference and specific heat capacity c is given by,

q = mc ΔT

Given that the volume of water is 1500 ml. Density of water is 1 g/ml thus mass of water is 1500 g. Specific heat capacity of water is  4.18 J/ °C g. Thus, the heat energy for the reaction taking place is calculated as follows:

q = 1500 g ×  4.18 J/ °C g × (25.9 - 24.2 °C)

  = 10659 J/mol

Hence, for 0.1 mol 10659  × 0.1 = 1065.9 J is the heat energy change for the reaction.

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Answer:

I don't know

Explanation:

pls I need a little bit answer

The given statement "Carbon in the ocean originates from the atmosphere" is true because Carbon is one of the most vital elements on Earth and is involved in various biogeochemical cycles, including the carbon cycle.

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The correct question would be as

Carbon in the ocean originates from the atmosphere. Please select the best answer from the choices provided. True or False