Question

Why does 3rd period contains 8elements and 4th period contains 18 elements in Modern priodic table​

Answer 1

Answer:

Explanation:

It was mossac periodic table....

It is kept so...as it they all are kept in different groups in terms of there characters like..... reaction etc....

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Answer 2

Explanation:

Basically Mosley invented the new periodic table. and he puts elements tighter which have same characteristics

like no. of cell

inization enthalpy

reaction power

and other many properties

that's why there are 8 elements in 3rd period and 18 in 4th period.

bcoz they have same properties and characteristics