Question

Element a, b, c and d having atomic no. 5, 12,13 and 19 respectively , (ju18) which element shows similar chemical properties - write electronic configuration of an element d -

Answer 1

a= boron (B)

b=magnesium (Mg)

c=aluminium (Al)

d=potassium (K)

put a '.' above K and under K write the atomic number according to the shells- 2,8,8,1