Use the periodic table to determine the number of valence electrons in the element Calcium (Ca). How many electrons will calcium gain or lose when it forms an ionic bond? Explain.

An calcium cation,

20

Ca

2

+

, has 18 electrons with an electron

configuration of

1s

2

2s

2

2p

6

3s

2

3p

6

.

A neutral argon atom,

18

Ar

, has 18 electrons with an electron

configuration of

1s

2

2s

2

2p

6

3s

2

3p

6

, the same as a

Ca

2

+

cation.

Explanation:

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