Question

1. which element forms diatomic molecules? (3pts)

□ carbon
□ bromine
□ sulfur
□ helium

1. how many nonmetals are in al(c₂h₃o₂)₃? (3pts)

Explanation:

Step1: Identify diatomic element

Diatomic elements exist as 2-atom molecules. Bromine is $\text{Br}_2$, a diatomic element; carbon (C, network solid), sulfur (S₈, polyatomic), helium (He, noble gas, monoatomic) are not.

Step2: Count nonmetals in $\text{Al(C}_2\text{H}_3\text{O}_2\text{)}_3$

First, identify nonmetals: C, H, O. Calculate total atoms:
C: $2 \times 3 = 6$
H: $3 \times 3 = 9$
O: $2 \times 3 = 6$
Sum: $6 + 9 + 6 = 21$

Answer:

1. bromine
2. 21