INTRODUCTION FOR ELEMENTS

Periodic table is arranged by what?

Father of Modern Chemistry

Listed 33 chemical elements

Created Law of Triads

Related properties

Created Gmelin system

Had identified ten triads, three groups of four and one group of five

Describing relationships between various groups of metals

Ability of Carbon to bond other 4 elements. (Concept
of Benzene) and founder of theory of chemical structure

Law of Octaves
Arrange the elements according to atomic number
but slightly differ from modern P.T.

Published periodic table

Modern Periodic table

groups/ family

periods/ series

# of shells

same valence
-same properties

The periodic table has a total of how many periods?

The periodic table has a total of how many groups?

They are referred to as representative elements of s and p block

Referred to as transition elements in the d and p block

Includes actinides and lanthanides series of f block

They are the most reaactive group which is stored in inert solvent, kerosene coated and paraffin

They dont occur free in nature and salt soluble

Valence electron of Group 1A