Q. 75.0( 2 Votes )

An element has mass number = 35 and atomic number = 17 find

(i) The number of neutrons in the element,

(ii) The number of electrons in the outermost shell.

Answer :

Mass number given = 35

Atomic number of element = 17


(i) Neutrons = 35 – 17 = 18


(ii) To find number of electrons in outermost shell we will have to find the electronic configuration of the element.


For atomic number 17,


K = 2


L = 8


M = 7


The number of electrons as we can see from the electronic configuration is 7.


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