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When calcium forms an ion, what is its charge? chemistry?

When calcium forms an ion, what is its charge?

my answer: 2-

3-

2-

2+

3+

When oxygen and aluminum form an ionic compound, what is the formula?

My answer: O2AI3

O2Al3

Al2O3

O3Al2

A3O2

  1. What subscripts would properly complete the formula unit K_O_?

My answer: 2,1

2,2

2,1

1,2

1,1

  1. Which of the following is not a correct ionic formula unit?

My answer: Ca3N2

BaO

LiS2

Ca3N2

KCl

  1. Which of the following is a correct formula unit?

My answer: Li3Al

AlP

ClO

Li3Al

PbCl

I am having trouble in Chemistry. I accidently clicked my test and I am stuck on these 5 questions. If its not too much trouble, can you help answer them?

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