Answer :
Answer:
- calcium - valency -: ( 2) valence electron -: 2
- magnesium - valency -:(2) valence electron -: 2
- oxygen - valency. -: (2) valence electron -:. 8
- argon -. valency -:. (doesn't have because it is a noble gas so that it doesn't have valency). valence electron-:. 8.....
Explanation:
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