2 years ago

How do you calculate the number of valence electrons in an atom?

Chemistry

1 answer:

Masja [62]2 years ago

5 0

By calculating it's number of GROUP........

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The atomic mass of hydrogen is one. True False

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Answer:

It's true :) Hope that helps

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3 years ago

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Which of the following molecules would have the lowest boiling point?

scZoUnD [109]

The CH4 molecule has the lowest molecular weight, so it has the lowest boiling point.

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3 years ago

The large number before a molecule in a chemical formula is called a _______________.

Komok [63]

The answer is coefficient

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Which of these descriptions are properties of salts? Check all that apply.

Stels [109]

❌formed by 2 ions

❌ionic bonds

✅yes because of solvation

✅yes electrolytes are substances that break apart into ions when dissolved

✅in itself but salt water is a good conductor

✅such as water

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3 years ago

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calculate atomic weight of silver which has two isotopes with the following properties : silver-107 (106.91 amu, 51.84% natural

Julli [10]

Answer: The atomic weight of silver is 107.87 amu

Explanation:

Mass of isotope silver-107 = 106.91 amu

% abundance of isotope silver -107 = 51.84% = $\frac{51.84}{100}=0.5184$

Mass of isotope silver-109 = 108.90 amu

% abundance of isotope silver-109 = 48.16% = $\frac{48.16}{100}=0.4816$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(106.91\times 0.5184)+(108.90\times 0.4816)]$

$A=107.87amu$

Thus atomic weight of silver is 107.87 amu

8 0

3 years ago