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3, జూన్ 2016, శుక్రవారం

CHEMISTRY STUDY MATERIAL: PERIODIC TABLE

PERIODIC TABLE Ø The arrangement of elements in Periodic table made easy to study their properties. Ø The elements are arranged in ... thumbnail 1 summary
PERIODIC TABLE

Ø The arrangement of elements in Periodic table made easy to study their properties.
Ø The elements are arranged in the increasing order of their atomic numbers.
-          Atomic number is equal to the number of electrons in the orbits ( or energy shells) of an atom.
Ø Modern periodic law -“The physical and chemical properties of elements are the periodic functions of their atomic number”.

ü  Modern Periodic Table has 18 Groups (vertical columns) and 7 Periods (horizontal rows).
ü  The elements belonging to a particular group have same number of valence electrons.
ü  The period number indicates the number of shells in the atom of an element.

Modern Periodic table (Long form of Periodic table)


valency
1+
2+










3+
4
3-
2-
1-
0

No. of valence electrons
1
2










3
4
5
6
7
8

GROUP NUMBER
IA
IIA










IIIA
IVA
VA
VIA
VIIA
0

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18


PERIOD 1 1 shell
H- 1
He-2

PERIOD 2
2 shells
Li
2,1
Be
2,2
B   2,3
C   2,4
N   2,5
O     2,6
F             2,7
Ne        2,8

PERIOD 3
3 shells
Na        2,8,1
Mg      2,8,2
Al       2,8,3
Si         2,8,4
P        2,8,5
S      2,8,6
Cl         2,8,7
Ar        2,8,8

PERIOD 4
4 shells
K       2,8,8,1
Ca    2,8,8,2   














Br
Kr

PERIOD 5
Rb
Sr














I
Xe

PERIOD 6
Cs
Ba














At
Rn

PERIOD 7
Fr
Ra

















ALKALI METALS
ALKALINE EARTH METALS
TRANSITION ELEMENTS (METALS)
HALOGENS
NOBLE GASES

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