Question

in an ato 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?
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Answer 1

a. the outermost shell is M.

b. the electrons in outermost shell is 10.

C. the atomic number of the element is 20.