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16 May, 13:21

Ght

#of

# of

Element

symbol

| # of

neutron

Atomic

mass

proton

electron

or

s

Co

A

B

49

C

27

D

73

31

G

H

58

115

181

|

Ba-2

137

16

18

16

+1
Answers (1)
  1. 16 May, 14:43
    0
    Answer 78

    Explanation:

    omg long
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