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HELP PLEASE ANSWER PLEASE ITS URGENT!!

-unnecessary comments will be reported.

HELP PLEASE ANSWER PLEASE ITS URGENT!! -unnecessary comments will be reported.-example-1
User Jonafato
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1 Answer

12 votes

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-

Step-by-step explanation:

User Neri Barakat
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