Q2 of 22 Page 174

How many sub shells present in a principal energy shell?

If n is the number of principle energy shell , n subshells are present in it.


For example first shell has one subshell , i.e. s subshell


Second shell (n = 2) has 2 sub shells , i.e. s and p sub shells


Third shell (n = 3) has 3 sub shells , i.e. s,p and d sub shells and so on…


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2

How many maximum number of electrons that can be accommodated in a sub shell?

 2

How many maximum number of electrons can be accommodated in an orbital?

 2

How many spin orientations are possible for an electron in an orbital?

3

In an atom the number of electrons in M-shell is equal to the number of electrons in the K and L shell. Answer the following questions.

a. Which is the outer most shell?


b. How many electrons are there in its outermost shell?


c. What is the atomic number of element?


d. Write the electronic configuration of the element.