Question

An atom of an element has three electrons in the 3rd shell which is the outermost shell of the atom.Write a) the electronic configuration b) the atomic number c) no. of protons d) valency e) the name of the element
class 9 chemistry
plz tell fast plz I need the answer fast.....​

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