Question

what detrmines the no. of elements tahat could be accomodated in the periods. Explain​

Answer 1

Answer:

Explanation:

Explanation:

Principle Quantum number is the number that tells you about the main shell in which the electron is present.And Azimuthal number is the number that tells you about the sub-shell to which the electron belongs to.

Let us consider the period 3 which consists of elements like Na,Mg,Al,Si,P,S,Cl,Ar. There are totally 8 elements by counting them. Argon's configuration is [Ne] 3s2, 3p6.

Because it is the third period the electrons can be filled only in 3s and 3p and now the orbitals present in 3s is 1 and in 3p it is 3, by adding them we get 4.

We know that each orbital contains 2 electrons and so it will be 4*2 that is it can accommodate 8 electrons.

Hence, the third period should have 8 elements.

It follows to other periods too, you can check it.