Periodic Table Of Elements

ADVERTISEMENT

Pe riod ic tab le of ele me nts
1
18
Rows in the table represent the periods and get longer as the atomic
Atomic number
Radioactive
Alkali metals
1
1
2
2
(number of protons
element
numbers increase. The number of electrons increase from left to right
in an atom)
Alkaline earth metals
He
H
Chemical
1
across the table. There are eighteen groups represented by columns
Liquid
formula
Transition metals
element
in the table; these groups have chemical features in common and
Number of
Other metals
Hydrogen
electrons
Helium
have the same number of electrons in the outer orbit of the atoms.
Gas
orbiting in
2
13
14
15
16
17
1.0079
4.0026
each shell
element
Other non-metals
Most of the elements are metals with the non-metals occurring more
Halogens
3
2
4
2
frequently in groups thirteen to eighteen. Groups one to twelve are
35
2
5
2
6
2
7
2
8
2
9
2
10
2
1
2
8
3
4
5
6
8
7
Li
Be
exclusively metals and on the boundary between the two are
Br
Inert gases
B
C
N
O
F
Ne
18
2
7
metalloids which display properties of both metals and non-metals.
Lanthanides
Some of the groups have collective names: group one are the alkali
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Bromine
Actinides
Fluorine
Neon
metals; group two are the alkaline earth metals; group eleven are the
6.9410
9.0122
79.9040
10.8110
12.0107
14.0070
15.9994
18.9984
20.1797
Trans-actinides
coinage metals; group seventeen are the halogens; and group
(Manmade atoms
11
2
12
2
13
2
14
2
15
2
16
2
17
2
18
2
eighteen are the noble gases. The first widely recognised table was
Atomic weight (of
8
8
8
8
8
8
8
8
that exist for less
most stable isotope
Na
Mg
Al
Si
P
S
Cl
Ar
1
2
3
4
5
6
7
8
published in 1869 by the Russian chemist Dmitri Mendeleev.
when in brackets)
3
than a second)
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulphur
Chlorine
Argon
3
4
5
6
7
8
9
10
11
12
22.9898
26.9815
28.0855
30.9738
32.0650
35.4530
39.9480
24.3050
19
2
20
2
21
2
22
2
23
2
24
2
25
2
26
2
27
2
28
2
29
2
30
2
31
2
32
2
33
2
34
2
35
2
36
2
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Ga
Ge
As
Se
Br
Kr
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
8
8
9
10
11
13
13
14
15
16
18
18
18
18
18
18
18
18
1
2
2
2
2
1
2
2
2
2
1
2
3
4
5
6
7
8
4
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
39.0980
40.0780
44.9560
47.8670
50.9420
51.9960
54.9380
55.8450
58.9330
58.6930
63.5460
65.3900
69.7230
72.6400
74.9220
78.9600
79.9040
83.8000
42
2
37
2
38
2
39
2
40
2
41
2
43
2
44
2
45
2
46
2
47
2
48
2
49
2
50
2
51
2
52
2
53
2
54
2
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Sn
Sb
Te
I
Xe
Rb
Pd
Ag
Cd
In
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
8
8
9
10
12
13
14
15
16
18
18
18
18
18
18
18
18
18
5
1
2
2
2
1
1
1
1
1
1
2
3
4
5
6
7
8
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
85.4680
87.6200
88.9060
91.2240
92.9060
95.9400
(98.0000)
101.0700
102.9100
106.4200
107.8700
112.4100
114.8200
118.7100
121.7600
127.6000
126.9000
131.2900
55
2
56
2
72
2
73
2
74
2
75
2
76
2
77
2
78
2
79
2
80
2
81
2
82
2
83
2
84
2
85
2
86
2
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Cs
Ba
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
32
32
32
32
32
32
32
32
32
32
32
32
32
32
18
18
32
6
E57 - E71
11
12
18
18
18
18
18
8
8
10
13
14
15
17
18
18
18
4
5
6
7
8
1
2
2
2
2
2
2
2
1
1
2
3
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
Cesium
Barium
Hafnium
132.9100
137.3300
178.4900
180.9500
183.8400
186.2100
190.2300
192.2200
195.0800
196.9700
200.5900
204.3800
207.2000
208.9800
(209.0000)
(210.0000)
222.0000
87
2
88
2
104
2
105
2
106
2
107
2
108
2
109
2
110
2
111
2
112
2
113
2
114
2
115
2
116
2
117
2
118
2
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Fr
Ra
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Cn Uut
Fl
Uup
Lv
Uus
Uuo
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
7
E89 - E103
18
18
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
8
8
10
11
12
13
14
15
16
17
18
18
18
18
18
18
18
Francium
Radium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadium
Roentgenium
Copernicium
Ununtrium
Flerovium
Ununpentium
Livermorium
Ununseptium
Ununoctium
1
2
2
2
2
2
2
2
2
2
2
3
4
5
6
7
8
(223.0000)
226.0300
261.1100
262.1200
264.1300
266.1400
(281.0000)
(280.0000)
(285.0000)
(284.0000)
(289.0000)
(288.0000)
(293.0000)
(294.0000)
(294.0000)
262.1100
226.0300
2
2
2
2
2
62
2
63
2
64
2
65
2
66
2
67
2
68
2
69
2
70
2
71
2
57
58
59
60
61
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
20
21
22
23
24
25
25
27
28
29
30
31
32
32
9
8
8
8
8
8
8
9
8
8
8
8
8
8
9
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Lanthanium
Cerium
Praseodyium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
138.9100
140.1200
140.9100
144.2400
(145.0000)
150.3600
151.9600
157.2500
158.9300
162.5000
164.9300
167.2600
168.9300
173.0400
174.9700
89
2
90
2
91
2
92
2
93
2
94
2
95
2
96
2
97
2
98
2
99
2
100
2
101
2
102
0
103
2
8
8
8
8
8
8
8
8
8
8
8
8
8
18
8
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
18
18
18
18
18
18
18
18
18
18
18
18
18
32
18
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
18
20
20
23
25
25
27
28
29
30
31
8
32
18
24
10
9
8
8
9
8
8
8
8
8
2
9
9
9
8
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
2
2
2
2
2
2
2
2
2
2
2
2
2
2
238.0300
237.0500
(227.0000)
232.0381
231.0359
(244.0000)
(243.0000)
(247.0000)
(247.0000)
(251.0000)
(252.0000)
(257.0000)
(258.0000)
(259.0000)
(262.0000)

ADVERTISEMENT

00 votes

Related Articles

Related forms

Related Categories

Parent category: Education
Go