An atom has 2K, 8L, 5M electrons. Write down its electronic configuration and indicate in it.
(i) number of sub-shells. (i) number of orbitals

Dear student,

Electronic configuration of element:   2,8,5     :   1s²2s²2p⁶3s²3p^{3
(I) ​}Subshells  5 :  (1s, 2s, 2p,3s,3p)
(ii) ​Orbitals      9 : (1s, 2s, 2px,2py,2pz,3s,3px,3py,3pz)

Regards