However, some group similarities also exist We shall first study the
general characteristics and their trends in the horizontal rows
(particularly 3d row) and then consider some group similarities 2nd Series
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
Z
39
40
41
42
43
44
45
46
47
48
5s
2
2
1
1
1
1
1
0
1
2
4d
1
2
4
5
6
7
8
10
10
10
3rd Series
La
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Z
57
72
73
74
75
76
77
78
79
80
6s
2
2
2
2
2
2
2
1
1
2
5d
1
2
3
4
5
6
7
9
10
10
Ac
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Cn
Z
89
104
105
106
107
108
109
110
111
112
7s
2
2
2
2
2
2
2
2
1
2
6d
1
2
3
4
5
6
7
8
10
10
4th Series
On what ground can you say that scandium (Z = 21) is a transition
element but zinc (Z = 30) is not On the basis of incompletely filled 3d orbitals in case of scandium atom
in its ground state (3d
1), it is regarded as a transition element