Question

for all formulas write the names to fill in the table or names given identify if the compound is ionic or covalent.

formula	name	ionic compound	covalent compound	if ionic - give the cation charge
(nh₄)so₄	ammonium sulfate	√		+1
o₂	oxygen		√
ca(hpo₄)₂	calcium phosphate	√		+2
n₃p	nitrogen phosphide		√
al₂s₃	aluminum sulfide	√		+3
sr₃(po₄)₂	strontium phosphate	√		+2
nano₃	sodium nitrate	√		+1
no₃	nitrogen trioxide		√
k₂s	potassium sulfide	√		+1
cobr₂	cobalt(ii) bromide	√		+2
so₂	sulfur dioxide		√
n₂o	dinitrogen monoxide		√
albr₃	aluminum bromide	√		+3
pcl₃	phosphorus trichloride		√
i₂	iodine		√

Explanation:

Step1: Recall ionic and covalent compound rules

Ionic compounds usually form between metals and non - metals or polyatomic ions. Covalent compounds form between non - metals.

Step2: Analyze each compound

• $(NH_4)SO_4$: Ammonium ion ($NH_4^+$) and sulfate ion ($SO_4^{2 - }$), ionic, cation charge of $NH_4^+$ is + 1.
• $O_2$: Non - metal elements bonded, covalent.
• $Ca(HPO_4)_2$: Calcium (metal) and hydrogen phosphate (polyatomic ion), ionic, calcium cation charge is + 2.
• $N_3P$: Non - metals, covalent.
• $Al_2S_3$: Aluminum (metal) and sulfur (non - metal), ionic, aluminum cation charge is + 3.
• $Sr_3(PO_4)_2$: Strontium (metal) and phosphate (polyatomic ion), ionic, strontium cation charge is + 2.
• $NaNO_3$: Sodium (metal) and nitrate (polyatomic ion), ionic, sodium cation charge is + 1 (not + 4 as written in the table).
• $NO_3$: Non - metals, covalent.
• $K_2S$: Potassium (metal) and sulfur (non - metal), ionic, potassium cation charge is + 1 (not + 4 as written in the table).
• $CoBr_2$: Cobalt (metal) and bromine (non - metal), ionic, cobalt(II) has a + 2 charge.
• $SO_2$: Non - metals, covalent.
• $N_2O$: Non - metals, covalent.
• $AlBr_3$: Aluminum (metal) and bromine (non - metal), ionic, aluminum cation charge is + 3.
• $PCl_3$: Non - metals, covalent.
• $I_2$: Non - metal elements bonded, covalent.

Answer:

Formula	Name	Ionic Compound	Covalent Compound	If Ionic - Cation Charge
$O_2$	Oxygen		√
$Ca(HPO_4)_2$	Calcium hydrogen phosphate	√		+ 2
$N_3P$	Nitrogen phosphide		√
$Al_2S_3$	Aluminum sulfide	√		+ 3
$Sr_3(PO_4)_2$	Strontium phosphate	√		+ 2
$NaNO_3$	Sodium nitrate	√		+ 1
$NO_3$	Nitrogen trioxide		√
$K_2S$	Potassium sulfide	√		+ 1
$CoBr_2$	Cobalt(II) bromide	√		+ 2
$SO_2$	Sulfur dioxide		√
$N_2O$	Dinitrogen monoxide		√
$AlBr_3$	Aluminum bromide	√		+ 3
$PCl_3$	Phosphorus trichloride		√
$I_2$	Iodine		√