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How many nitrogen atoms are in each formula unit of lead $Pb ({NO}_{2})_{2}$ ?

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answer is B.

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Detailed Solution

The smallest component of an element is called an atom.
A molecule is made up of two or more atoms that are chemically connected by bonds.
For instance, a hydrogen gas molecule results from the bonding of two hydrogen (H-H) atoms.

H (atom) + H (atom) = H_{2} (Molecule)

You must first review the lead nitrite formula, which is

Pb ({NO}_{2})_{2}

This essentially means you have
1 Lead - Pb atoms, 2 Nitrogen - N atoms And 4 Oxygen - O atoms
2 nitrogen atoms are in each formula unit of lead

Pb ({NO}_{2})_{2}

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