WOULD SOMEONE PLEASE CHECK MY ANSWERS?

1. Which of these pairs of elements is most likely to be part of a polyatomic ion?

Rb and Cl

Ba and O

Question

WOULD SOMEONE PLEASE CHECK MY ANSWERS?

1. Which of these pairs of elements is most likely to be part of a polyatomic ion?

       Rb and Cl

       Ba and O <-----

       C and N

2. Which of the following element combinations will likely form polyatomic ions?

       oxygen and carbon <-----

       sodium and bromine

       xenon and neon

       cesium and chlorine

       K and Br

4. Which of the following ions is not an oxyanion?

       CO^3^2-

       CN-

       SO^4^2-

       NO-

anonymous · Answer

Oops, and the last one is CN-. Forgot to mark which one I picked.