Question

determine the name for each compound from its formulas. k₂o: ni₂se₃: n₂o₅:

Explanation:

Step1: Identify cation and anion for $K_2O$

$K$ is potassium (cation), $O$ is oxide (anion).

Step2: Name the compound

It is potassium oxide.

Step3: Identify cation and anion for $Ni_2Se_3$

$Ni$ is nickel (cation), $Se$ is selenide (anion). Nickel has variable oxidation - states, here it is +3.

Step4: Name the compound

It is nickel(III) selenide.

Step5: Identify elements for $N_2O_5$

It is a covalent compound with nitrogen and oxygen.

Step6: Name the compound using prefixes

It is dinitrogen pentoxide.

Answer:

$K_2O$: Potassium oxide
$Ni_2Se_3$: Nickel(III) selenide
$N_2O_5$: Dinitrogen pentoxide