Question

which of the following is the correct formula for the compound formed by chlorine (oxidation number of 1-) and scandium (oxidation number of +3)?
select one:
a. sccl₃
b. sccl
c. mgcl₂
d. sc₃cl

the correct name for the compound that has the formula k₂o is...
select one:
a. oxygen potasside.
b. potasside oxygen.
c. potassium oxide
d. potassium oxygen.

Explanation:

Step1: Balance charges for Sc-Cl compound

Sc has +3, Cl has -1. Need 3 Cl to balance: $+3 + 3(-1) = 0$, so formula is $\text{ScCl}_3$.

Step2: Name $\text{K}_2\text{O}$

Cation (potassium, K⁺) first, then anion (oxide, O²⁻) with -ide suffix.

Answer:

1. a. $\text{ScCl}_3$
2. c. potassium oxide