Period (periodic table)

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A period in the periodic table is any horizontal row of elements.

The elements in a certain period all increase one by one in atomic numbers. The elements in the same period are very metallic on the left, and nonmetallic on the right. As you go across a period towards the right, the size of the atom gets larger, because protons and electrons are increasing.

First period has 2 elements. Second and third period has 8 elements. Forth and fifth has 18 elements . And sixth and seventh period has 32 elememts f-block elements are counted in sixth and seventh periods. Hence, it has 32 elements in it.

Standard periodic table[change | change source]

Group → 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Period ↓
1 1
H

2
He
2 3
Li
4
Be

5
B
6
C
7
N
8
O
9
F
10
Ne
3 11
Na
12
Mg

13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4 19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
5 37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
6 55
Cs
56
Ba
*
Lanthanides
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
7 87
 Fr
88
Ra
**

Actinides

104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Nh
114
Fl
115
Mc
116
Lv
117
Ts
118
Og
8 119
 Uue
120
 Ubn
**

Superactinides


* Lanthanide Series 57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
** Actinide Series


89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr
** Superactinide Series


121
Ubu
122
Ubb
123
Ubt
124
Ubq
125
Ubp
126
Ubh
127
Ubs
128
Ubo
129
Ube
130
Utn
131
Utu
132
Utb


Chemical Series of the Periodic Table


State at standard temperature and pressure. The color of the number (atomic number) above the element symbol shows the state of the element at normal conditions.
  • those in blue are gases
  • those in green are liquids
  • those in black are solid