The atomic number of astatine which belongs to the sixth period is:
53
54
86
85
A
53
B
54
C
85
D
86
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Solution
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The correct option is C 85 He (2) F Ne (10) Cl Ar (18) Br kr (36) I xe (54) As Rn (86) Since the position of astatine is just before the Rn. so atomic no of astatine is 85
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