Question

The valence shell of the element X contains I electron in s su
tement contains I electron in 5s subshell and below that shell. 4 electrons
in 4d subshell. The element belongs to which group (IUPAC) in periodic table
(A) 4th group
(B) 5th group
(C) 6th group
(D) 7th group
​

Answer 1

Answer:

(A) 4th group

Because the atomic no. should be around 25-30 .So that it occupies 5s subshell and 4d subshell