Question

An atom of an element has three electrons in the third shell which is the outermost shell. Write (a) the electronic configuration (b) the atomic number (c) number of protons (d) valency (e) the name of the element (f) its nature whether metal or non-metal. *

4 points

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Answer 1

Answer:

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

(a) Electronic configuration : 2,3,8 , (b) Atomic number =No of electrons =13

(c ) Number of protons =No of electrons -=13 , (d) Valency of the element =3

(e ) The element with Z=13 is aluminium (Al) , (f) It is a metal

Explanation: