Period (Periodic Table)

Period Periodic Table

In chemistry, a period is a horizontal row of elements in the periodic table. From top to bottom, there are a total of 7 periods in the periodic table. A combination of 7 periods in the periodic table makes a total of 118 known elements. (period 1: 2 elements, period 2: 8 elements, period 3: 8 elements, period 4: 18 elements, period 5: 18 elements, period 6: 32 elements, and period 7: 32 elements)

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
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
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
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
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
period
1 – period 1 element 5 – period 5 element
2 – period 2 element 6 – period 6 element
3 – period 3 element 7 – period 7 element
4 – period 4 element

FAQs on Period (Periodic Table)

‣ What is the period for helium?

The helium is in period 1 (first row) of the periodic table.
‣ What is period 7 on the periodic table?

Period 7 is the seventh row of the periodic table that includes the chemical elements from francium to oganesson.
‣ How many elements are there in 7th period?

There are a total of 32 chemical elements in the 7th period of the periodic table.
‣ Which element in period 3 on the periodic table is a metalloid?

The silicon element located in period 3 of the periodic table is a metalloid.
‣ What is period 4 on the periodic table?

Period 4 is the fourth row of the periodic table that includes the chemical elements from potassium to krypton.
‣ What is period 2 on the periodic table?

Period 2 is the second row of the periodic table that includes the chemical elements from lithium to neon.
‣ What is period 5 on the periodic table?

Period 5 is the fifth row of the periodic table that includes the chemical elements from rubidium to xenon.
‣ What are the period names on the periodic table?

The period names on the periodic table are as follows:

Period 1: includes elements hydrogen (H) and helium (He)
Period 2: includes elements from lithium (Li) to neon (Ne)
Period 3: includes elements from sodium (Na) to argon (Ar)
Period 4: includes elements from potassium (K) to krypton (Kr)
Period 5: includes elements from rubidium (Rb) to xenon (Xe)
Period 6: includes elements from caesium (Cs) to radon (Rn)
Period 7: includes elements from francium (Fr) to oganesson (Og)
‣ How many halogens are in period 3 of the periodic table?

The chlorine element located in period 3 of the periodic table is a halogen.
‣ How many metals are in second period of periodic table?

The lithium element and beryllium element are two metals located in the second period of the periodic table.
‣ How many group 17 elements are in period 3 of the periodic table?

The chlorine (Cl) located in period 3 of the periodic table is a group 17 element.
‣ How many elements are there in 6th period of periodic table?

There are a total of 32 chemical elements in the 6th period of the periodic table.

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