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Question: An element has atomic number 79. Predict the group and period in which the lement is placed....

An element has atomic number 79. Predict the group and period in which the lement is placed.

A

2nd group, 7th period

B

11th group, 6th period

C

13th group, 6th period

D

12th group, 6th period

Answer

11th group, 6th period

Explanation

Solution

: Z = 79 [Xe]4f145d106s1\lbrack Xe\rbrack 4f^{14}5d^{10}6s^{1} (n = 6)

As n = 6, the element belongs to 6th period.

Group, = ns + (n – 1) d, 1 + 10 = 11