Question

The subshell electronic configuration of an element X is [Ar] 3d84s2

a) How many shells are there in an atom of this element? ( 1mark)

b) The last electron filling occurs in which subshell? (1 mark)

c) Find the group number of this element? (1 mark)

d) Find the atomic number of this element? (1 mark)​

Answer 1

a)4shells

b)4s subshell

c)10group

d) atomic number=18+8+2=28