Question

Oxygen is in group 16 of the periodic table. An oxygen ion (O2-) has a charge of -2. Which of the following would be most likely to combine with an oxygen ion to form a new compound?

A.
a calcium ion with a charge of +2
B.
a fluoride ion with a charge of -1
C.
a neon atom that has no charge
D.
a sulfide ion with a charge of -2

Answer 1

A a calcium ion with a charge of +2

Step-by-step explanation:

Think of it this way:

every atom needs 8 electrons in the outer shell to be happy.

If an electron has a negative 2 charge that means that it needs 2 more electrons to be happy and calcium needs to lose to of its electrons to be happy. So calcium will happily give its two outer elctrons to oxygen.