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Naddika [18.5K]
3 years ago
6

HELP PLEASE ANSWER PLEASE ITS URGENT!! -unnecessary comments will be reported.

Chemistry
1 answer:
Verizon [17]3 years ago
8 0

Answer:

19. 1, 2, 3, 4, 5, 6, 7, 8

20. Li=1+, Be=2+, B=3+, C=4+

21. N=3-, O=2-, F=1-

Explanation:

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