Periodic Table | SEE Class 10 | Chemistry Notes

  1. Periodic Table: The periodic table is the intersection of columns and raws to contain elements on the basis of certain defined properties.
  • The scientific classification of elements to make its study easy is called periodic table.
  • Diagram:
1 2 3 4 5
1 H
2 Li Be B C N
3 Na Mg li Si iP
4 K Ca 1 Ti V
5 Rb Sr Y Zr Nb
  • Periodic Table:-
  1. Old or short form or Mendleev periodic Table
  2. Modern or long form or Mosely periodic table.
  3. Older short form periodic table and Modern/ long form periodic table.
Old Periodic Table Modern Periodic Table
1.       The physical and chemical properties of elements are periodic function of their atomic weight. 1.       The physical and chemical properties of elements are periodic function of atomic numbers.
2.       Elements are arranged on the basic of increasing atomic weights. 2.       Elements are arranged on the basis of increasing atomic numbers.
3.      It is designed by Russian scientist – Mendleev 3.       It is designed by English scientist – Moseley.
4.       It contains only 63 elements. 4.       It contains 118 elements.
5.       It has seven (1-7) periods and eight (I-VIII) groups. 5.       It contains seven periods and 9 groups. There are 18 groups including sub-groups.
6.       Disadvantage:

a.       Hydrogen is non-metal but placed with metals.

b.      The place of isotopes are not determined.

c.       The place of lanthanides and table actinides are not justified.

6.       Disadvantages:

a.       Hydrogen is the non-metal but placed with metals.

b.      The lanthernides and actinides are placed at the bottom of periodic table.

7.       Advantage: 7.   Advantage:

a.       The place of isotopes are determined.

b.      The place of lanthenidies and actinides are justified.

c.       These elements of similar properties are placed in similar groups.

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