Modern Periodic Table
Modern Periodic Table
Modern periodic table: In 1913, Henry Moseley showed that the atomic number of an element is a more fundamental property and on the basis of this, he modified Mendeleev’s periodic law as “physical and chemical properties of the elements are a periodic function of their atomic number”. This is called modern periodic law. When the elements were arranged in the increasing order of the atomic number, the obtained table is called modern periodic law.
Features of Modern Periodic Table:
This table has 18 vertical columns, known as groups and 7 horizontal rows, known as periods.
Features of Groups:
Features of Periods:
We can explain the number of elements in the periods based on how electrons are filled into various shells. Maximum number of electrons that can be accommodated in a shell is given by the formula, . Where, n = number of given shell from the nucleus.
Some Facts:
The identities of some elements included in the seventh period have not been fully established. It can also be regarded as an incomplete period.
Block of Periodic Table:
The periodic table is divided in four blocks:
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