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Chemistry | Symbol, Valency, Atomic Mass
 |
| Chemistry | Symbol, Valency, Atomic Mass |
What is symbol?
The short hand sign representation for full name of element
is called symbol.
VALENCY :-
Sl No
|
Element
|
Symbol
|
1
|
Hydrogen
|
H
|
2
|
Helium
|
He
|
3
|
Lithium
|
Li
|
4
|
beryllium
|
Be
|
5
|
boron
|
B
|
6
|
carbon
|
C
|
7
|
nitrogen
|
N
|
8
|
oxygen
|
O
|
9
|
fluorine
|
F
|
10
|
neon
|
Ne
|
11
|
sodium
|
Na
|
12
|
magnesium
|
Mg
|
13
|
aluminium
|
Al
|
14
|
silicon
|
Si
|
15
|
phosophorus
|
P
|
16
|
Sulphur
|
S
|
17
|
chlorine
|
Cl
|
18
|
Argon
|
Ar
|
19
|
potassium
|
K
|
20
|
Calcium
|
Ca
|
21
|
scandium
|
Se
|
22
|
titanium
|
Ti
|
23
|
vanadium
|
V
|
24
|
chromium
|
Cr
|
25
|
manganese
|
Mn
|
26
|
Iron
|
Fe
|
27
|
cobalt
|
Co
|
28
|
Nikel
|
Ni
|
29
|
Copper
|
Cu
|
30
|
Zinc
|
Zn
|
Latin Name of Element :-
Element
|
Latin
Name
|
Symbol
|
Sodium
|
Natirum
|
Na
|
Potassium
|
Kalium
|
K
|
Iron
|
Ferrum
|
Fe
|
Silver
|
Argentum
|
Ag
|
Gold
|
Aurum
|
Au
|
Lead
|
Plumbum
|
Pb
|
Tin
|
Stannum
|
Sn
|
Antimony
|
Stibium
|
Sb
|
Mercury
|
Hydragyrum
|
Hg
|
Copper
|
Cuprum
|
Cu
|
Tungsten
|
Wolfram
|
W
|
VALENCY :-
Old concept of valency :-
valency of an element may be defined as the number of chlorine(cl)
atom or the double number of oxygen atom with which one atom of that element
can combine.
EX:-
Name
|
Valency
|
MgCl2
|
2
|
NH3
|
3
|
AlCl3
|
3
|
CO2
|
4
|
Al2O3
|
3
|
Modern concept of valency :-
The number of electron loss, gained & shared by an
element to get this stable electronic configuration of inert gas as called its
valency.
Inert gas are :-He, Ne, Ar, Kr, Xe, Rn
Element
|
Valency
|
H
|
1
|
He
|
0
|
Li
|
1
|
Be
|
2
|
B
|
3
|
C
|
4
|
N
|
3
|
O
|
2
|
F
|
1
|
Ne
|
0
|
Na
|
1
|
Mg
|
2
|
Al
|
3
|
Si
|
4
|
P
|
3
|
S
|
2
|
Cl
|
1
|
Ar
|
0
|
K
|
1
|
Ca
|
2
|
Atomic Mass :-
Atomic mass of an elements is the relative average mass of
it one atom as an compare to the mass of 1/12th the mass of
carbon atom.
Element
|
Atomic Mass
|
Whole Number
|
H
|
1.008
|
1
|
He
|
4.0026
|
4
|
Li
|
6.94
|
7
|
Be
|
9.01
|
9
|
B
|
10.81
|
11
|
C
|
12.01
|
12
|
N
|
14.006
|
14
|
O
|
15.99
|
16
|
F
|
18.99
|
19
|
Ne
|
20.17
|
20
|
Na
|
22.98
|
23
|
Mg
|
24.305
|
24
|
Al
|
26.98
|
27
|
Si
|
28.08
|
28
|
P
|
30.97
|
31
|
S
|
32.065
|
32
|
Cl
|
35.5
|
35.5
|
Ar
|
39.09
|
39
|
K
|
39.94
|
40
|
Ca
|
40.078
|
40
|
Se
|
44.95
|
45
|
Ti
|
47.86
|
48
|
V
|
50.94
|
51
|
Cr
|
51.99
|
52
|
Mn
|
54.93
|
55
|
Fe
|
55.84
|
56
|
Co
|
58.93
|
59
|
Ni
|
58.69
|
59
|
Cu
|
63.5
|
63.5
|
Zn
|
65.39
|
65
|
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