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single atoms
diatomic molecules
molecules
formula units
ca(oh)₂
so₂
f₂
kmno₄
cdcl₂
mgcl₂
nitrogen
cobalt
ag
xenon
c₂h₆
bromine

Explanation:

Step1: Identify Single atoms

Single atoms are elements that exist as individual atoms (noble gases, metals in atomic form). So Cobalt (Co), Ag (Silver), Xenon (Xe) are single atoms. Wait, the labels: Cobalt, Ag, Xenon. So move Cobalt, Ag, Xenon to Single atoms.

Step2: Identify Diatomic molecules

Diatomic molecules are molecules with two atoms, like \( F_2 \) (Fluorine), \( N_2 \) (Nitrogen), \( Br_2 \) (Bromine). Wait, the labels: \( F_2 \), Nitrogen (which is \( N_2 \)), Bromine (which is \( Br_2 \)). So move \( F_2 \), Nitrogen, Bromine to Diatomic molecules.

Step3: Identify Molecules (polyatomic or non - diatomic molecular compounds)

Molecules are covalent compounds (non - ionic) with more than two atoms or diatomic? Wait, \( SO_2 \) (sulfur dioxide, molecular), \( C_2H_4 \) (ethylene, molecular). So \( SO_2 \), \( C_2H_4 \) are molecules.

Step4: Identify Formula units (ionic compounds)

Formula units are ionic compounds (composed of ions). \( Ca(OH)_2 \) (ionic, calcium hydroxide), \( KMnO_4 \) (ionic, potassium permanganate), \( CdCl_2 \) (ionic, cadmium chloride), \( MgCl_2 \) (ionic, magnesium chloride) are ionic compounds, so they are formula units.

Answer:

• Single atoms: Cobalt, Ag, Xenon
• Diatomic molecules: \( F_2 \), Nitrogen, Bromine
• Molecules: \( SO_2 \), \( C_2H_4 \)
• Formula units: \( Ca(OH)_2 \), \( KMnO_4 \), \( CdCl_2 \), \( MgCl_2 \)