Question

no₂ cu nacl hi mgcl₂ hg cl₂ n₂ atomic elements molecular elements molecular compounds ionic compounds

Explanation:

• Atomic elements: These are elements that exist as single atoms. \(Cu\) (copper) and \(Hg\) (mercury) are metals that typically exist as atomic elements.
• Molecular elements: These are elements that exist as molecules. \(Cl_{2}\) (chlorine) and \(N_{2}\) (nitrogen) are diatomic molecules.
• Molecular compounds: These are compounds formed by the sharing of electrons between non - metal atoms. \(NO_{2}\) (nitrogen dioxide) and \(HI\) (hydrogen iodide) are molecular compounds.
• Ionic compounds: These are compounds formed by the transfer of electrons from a metal to a non - metal. \(NaCl\) (sodium chloride) and \(MgCl_{2}\) (magnesium chloride) are ionic compounds.

Answer:

• Atomic elements: \(Cu\), \(Hg\)
• Molecular elements: \(Cl_{2}\), \(N_{2}\)
• Molecular compounds: \(NO_{2}\), \(HI\)
• Ionic compounds: \(NaCl\), \(MgCl_{2}\)