Question

strontium and calcium form 2+ ions. strontium has one more shell than calcium. strontium has more electrons than calcium. strontium and calcium tend to gain 2 electrons. strontium and calcium have the same number of valence electrons.

Explanation:

Strontium (Sr) and calcium (Ca) are in Group 2 of periodic table. They have 2 valence - electrons and form 2+ ions by losing 2 electrons. Sr has more electrons and one more electron - shell than Ca as it is below Ca in the group.

Answer:

1. Strontium and calcium form 2+ ions. - True
2. Strontium has one more shell than calcium. - True
3. Strontium has more electrons than calcium. - True
4. Strontium and calcium tend to gain 2 electrons. - False
5. Strontium and calcium have the same number of valence electrons. - True