Question

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 outermost shell?
(b) How many electrons are there in its outermost shell ?
(c) What is the atomic number of an element?
(d) Write the electronic configuration of the element?

Answer 1

Answer:

(a) M shell

(b) no: of elctrons in K shell - 2

no: of elctrons in L shell - 8

so no: of elctrons in M shell - 8+2 = 10

(c) the atomic number of the element - 2+8+10 = 20

(d) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2

I think this is the answer...........I hope it helps you

Answer 2

Answer:

Since the number of electrons in M shell is equal to sum of electrons in K and L shells, the K and L shells will be fully filled.

Maximum number of electrons  in K-shell is 2 and in M-shell is 8. total number of electrons in K and M shell are 10.So the number of electrons in M shell is also 10.

Total electrons is 10+10 = 20.

So K has 2, L has 8 and M has 10 electrons.

A) The outermost shell is M

B) Number of electrons in outermost shell is 10

C) Atomic number is 20

D) Atomic configuration - K has 2, L has 8 and M has 10 electrons