Question

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 1

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