INTRODUCTION FOR ELEMENTS
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1
Periodic table is arranged by what?
Atomic number, electron configuration and chemical properties
2
Father of Modern Chemistry
Antoine Lavoisier
3
Listed 33 chemical elements
Antoine Lavoisier
4
Created Law of Triads
Johann Wolfgang Dobereiner
5
Related properties
Law of Triads
6
Created Gmelin system
Leopold Gmelin
7
Had identified ten triads, three groups of four and one group of five
Gmelin System
8
Describing relationships between various groups of metals
Jean Baptiste Dumas
9
Ability of Carbon to bond other 4 elements. (Concept
of Benzene) and founder of theory of chemical structure
of Benzene) and founder of theory of chemical structure
August Kekule
10
Law of Octaves
Arrange the elements according to atomic number
but slightly differ from modern P.T.
Arrange the elements according to atomic number
but slightly differ from modern P.T.
John Newlands
11
Published periodic table
Dmitri Ivanovich Mendeleev and Juliu Lothar Meyer
12
Modern Periodic table
Henry Mosley
13
groups/ family
vertical
14
periods/ series
horizontal
15
# of shells
PERIODS
16
same valence
-same properties
-same properties
GROUPS
17
The periodic table has a total of how many periods?
7
18
The periodic table has a total of how many groups?
18
19
They are referred to as representative elements of s and p block
Group A
20
Referred to as transition elements in the d and p block
Group B
21
Includes actinides and lanthanides series of f block
Inner transition metals
22
They are the most reaactive group which is stored in inert solvent, kerosene coated and paraffin
Group 1A Alkali Metals
23
They dont occur free in nature and salt soluble
Group 1A
24
Valence electron of Group 1A
1
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