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Alla [95]
3 years ago
11

1)

Physics
1 answer:
Ket [755]3 years ago
3 0

Answer:

1) D

2) A

Explanation:

1) Each group has the same number of valence electrons, which are the outer electrons.

2) Ionic bonds are between a metal and non - metal, the metal being sodium and the non - metal being chlorine.

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