Question

Which two elements will most likely form an ionic bond? krypton and lithium magnesium and silicon calcium and potassium iodine and chlorine

Answer 1

Let's list our elements:

Kr + Li

Mg + Si

Ca + K

I + Cl

In the first pair, krypton has no charge, while lithium has a positive charge of one.

Magnesium has a positive charge of 2, while silicon has a negative charge of 4.

Calcium has a positive charge of 2 and potassium has a positive charge of one.

Iodine and chlorine both have a negative charge of one.

Because magnesium and silicon have opposite charges, they can come together to form an ionic compound:

Mg(2+) and Si(4-)

Two magnesium atoms are required to neutralize the silicon ions.

This forms the compound Mg2Si, or magnesium silicide.

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