Question

An atom consist of 3shells and the outermost shell contain 7 electrons.

a) Write the Atomic number of the given element

b) Write the complete subshell electonic configuration

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Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

The third shell is M shell .If the atom of the element has three electons in the third this means that K and L shells are already filled <br> (a) Electronic configuration : 2,3,8 , (b) Atomic number =No of electrons =13 <br> (c ) Number of protons =No of electrons -=13 , (d) Valency of the element =3 <br> (e ) The element with Z=13 is aluminium (Al) , (f) It is a metal