Question

7. The electronic configuration of an
element is 2, 8, 7. In which period and group
does the element belongs?
O
a. 2nd group and 3rd period
O b. 13th group and 3rd period
O
c. 17th group and 3rd period
O d. 17th group and 2nd period

Answer 1

Answer:

c this element belongs to 17th group and 3rd priod

Answer 2

Answer:

17th group, 3rd period

valence eletrons = 7

so, group = 7 + 10 = 17

no. of shells = 3

so, it belongs to 3rd period

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