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Use the periodic table to determine the number of valence electrons in the element Calcium (Ca). How many electrons will calcium gain or los
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Answer:
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:
Calcium would lose 2 electrons when forming an ionic bond, so it’s new electron configuration would be 2-8-8. it loses 2 because it’s closer to having a full valence shell by losing the 2