Atom of an element ‘X' has 3 electrons in the outermost M shell. What will be the atomic number of the element ‘X’? Name the element ‘X'. Write the electronic configuration and nuclear composition of ‘X'. Draw a schematic diagram of its atom showing the distribution of electrons in the orbits. If the element ‘X' combines with another element 'Y’ whose electronic configuration is 2, 8, 7 what will be the formula of the compound thus formed?

Atom of an element ‘X' has 3 electrons in the outermost M shell. W

1.	Atom of an element ‘X' has 3 electrons in the outermost M shell. What will be the atomic number of the element ‘X’? Name the element ‘X'. Write the electronic configuration and nuclear composition of ‘X'. Draw a schematic diagram of its atom showing the distribution of electrons in the orbits. If the element ‘X' combines with another element 'Y’ whose electronic configuration is 2, 8, 7 what will be the formula of the compound thus formed?
Answer» tion: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