Question
Which atoms are indicated by the following configurations?
(a) [He] 2s1
(b) [Ne] 3s2 3p3
(c) [Ar] 4s2 3d1.
Solution
(a) [He] 2s1, the atom is lithium (3Li).
(b) [Ne] 3s2 3p3, the atom is phosphours (15P).
(c) [Ar] 4s2 3d1, the atom is scandium ( 21Sc).
