Question

How does calcium form an ion?

Answer 1

Answer: Some atoms gain or lose more than 1 electron. Calcium loses 2 electrons when it becomes an ion. When ions come together to form an ionic bond, they always join in numbers that exactly cancel out the positive and negative charge.

Explanation:

That's it.

Answer 2

Answer: By losing its two outermost electron

Explanation:

Calcium is a element that belongs to group 2 in the periodic table. It has an atomic number of 20, and an electronic configuration of 2, 8, 8, 2.

Hence, to form an octet structure, it gives off its two electrons as shown below:

Ca <----> Ca2+ + 2e-

Thus, by losing its two outermost electrons, a positively charged calcium ion (Ca2+) is formed