Question

the outer most shell M of an atom having 3 electrons what is its atomic number ?
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Answer 1

Answer:

M is outermost shell

that s 3rd shell...

we know tht K have 2 electrons

L have 8 electrons

and M have 3 electrons

so total electrons are 2 + 8 + 3 = 13 electrons

as atomic number of element = total no of electrons in neutral atom

so , atomic number of atom is = 13

it is aluminum

Answer 2

13 is it's atomic number

and it is aluminium