Question
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 (n = 6)
As n = 6, the element belongs to 6th period.
Group, = ns + (n – 1) d, 1 + 10 = 11