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
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Hydrogen
2
He
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Helium
2 3
Li
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Lithium
4
Be
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Beryllium
5
B
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Boron
6
C
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Carbon
7
N
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Nitrogen
8
O
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Oxygen
9
F
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Fluorine
10
Ne
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Neon
3 11
Na
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Sodium
12
Mg
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Magnesium
13
Al
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Aluminium
14
Si
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Silicon
15
P
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Phosphorus
16
S
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Sulfur
17
Cl
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Chlorine
18
Ar
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Argon
4 19
K
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Potassium
20
Ca
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Calcium
21
Sc
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Scandium
22
Ti
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Titanium
23
V
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Vanadium
24
Cr
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Chromium
25
Mn
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Manganese
26
Fe
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Iron
27
Co
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Cobalt
28
Ni
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Nickel
29
Cu
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Copper
30
Zn
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Zinc
31
Ga
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Gallium
32
Ge
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Germanium
33
As
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Arsenic
34
Se
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Selenium
35
Br
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Bromine
36
Kr
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Krypton
5 37
Rb
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Rubidium
38
Sr
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Strontium
39
Y
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Yttrium
40
Zr
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Zirconium
41
Nb
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Niobium
42
Mo
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Molybdenum
43
Tc
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Technetium
44
Ru
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Ruthenium
45
Rh
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Rhodium
46
Pd
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Palladium
47
Ag
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Silver
48
Cd
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Cadmium
49
In
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Indium
50
Sn
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Tin
51
Sb
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Antimony
52
Te
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Tellurium
53
I
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Iodine
54
Xe
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Xenon
6 55
Cs
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Caesium
56
Ba
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Barium
72
Hf
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Hafnium
73
Ta
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Tantalum
74
W
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Tungsten
75
Re
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Rhenium
76
Os
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Osmium
77
Ir
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Iridium
78
Pt
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Platinum
79
Au
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Gold
80
Hg
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Mercury
81
Tl
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Thallium
82
Pb
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Lead
83
Bi
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Bismuth
84
Po
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Polonium
85
At
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Astatine
86
Rn
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Radon
7 87
Fr
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Francium
88
Ra
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Radium
104
Rf
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Rutherfordium
105
Db
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Dubnium
106
Sg
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Seaborgium
107
Bh
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Bohrium
108
Hs
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Hassium
109
Mt
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Meitnerium
110
Ds
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Darmstadtium
111
Rg
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Roentgenium
112
Cn
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Copernicium
113
Nh
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Nihonium
114
Fl
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Flerovium
115
Mc
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Moscovium
116
Lv
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Livermorium
117
Ts
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Tennessine
118
Og
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Oganesson
57
La
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Lanthanum
58
Ce
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Cerium
59
Pr
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Praseodymium
60
Nd
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Neodymium
61
Pm
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Promethium
62
Sm
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Samarium
63
Eu
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Europium
64
Gd
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Gadolinium
65
Tb
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Terbium
66
Dy
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Dysprosium
67
Ho
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Holmium
68
Er
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Erbium
69
Tm
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Thulium
70
Yb
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Ytterbium
71
Lu
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Lutetium
89
Ac
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Actinium
90
Th
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Thorium
91
Pa
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Protactinium
92
U
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Uranium
93
Np
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Neptunium
94
Pu
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Plutonium
95
Am
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Americium
96
Cm
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Curium
97
Bk
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Berkelium
98
Cf
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Californium
99
Es
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Einsteinium
100
Fm
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Fermium
101
Md
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Mendelevium
102
No
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Nobelium
103
Lr
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Lawrencium
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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