Question

An atom of an element has 4 energy shells.It has 2 Valence shell electrons and the 2 inner shells have 8 electrons each.Find the atomic number (Z)and mention the name of the element.​

Answer 1

Answer:

it has 20 atomic number

Explanation:

the element is Calcium because it has 2 valence electrons in 4th shell,

so,2+8+8+2

=20

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