Answer: Option (b) is the correct answer.
Explanation:
It is known that metals are the species which readily lose an electron and tend to attain a positive charge.
For example, atomic number of sodium is 11 and its is an alkali metal. It electronic distribution is 2, 8, 1.
And, in order to attain stability it readily loses an electron and thus it become ion.
Also, it is known that species which tend to transfer or donate their valence electrons to other atoms tend to form ionic bond and the compound formed is known as ionic compound.
Therefore, we can conclude that the statement metal atoms held together by ionic bonds best describes a metal solid.
The percent composition by mass for sodium (Na) in Sodium phosphate (Na₃PO₄) : 42.07%
<h3>Further explanation</h3>Given
Compound of Sodium phosphate (Na₃PO₄)
Required
The percent composition by mass for sodium (Na)
Solution
<em>The Comparative Law (Proust ) : compounds are formed from elements with the same Mass Comparison</em>
MW Na₃PO₄ = 163,94 g/mol
Ar Na=22,989769g/mol