Question

1. An example of a polyatomic ion is:
a) SO²-4
b) Ca?
c) O2
d) NaCl​

Answer 1

A is the answer. Ca(calcium) is an element, O2 is a diatomic element, and NaCl is a compound composed of Na(sodium) and Cl(chlorine)

Step-by-step explanation:

hopefully that helps!!!