Writethe namesand atomic numbers of the followingelements : (i) The fourthalkali metal (ii) The thirdalkaline earthmetal (iii) Thefifthelementof the firsttransition series (iv) Thefirstinnertransition element and (v) Thesixthnoblegas.

Writethe namesand atomic numbers of the followingelements : (i) The fo

1.	Writethe namesand atomic numbers of the followingelements : (i) The fourthalkali metal (ii) The thirdalkaline earthmetal (iii) Thefifthelementof the firsttransition series (iv) Thefirstinnertransition element and (v) Thesixthnoblegas.
Answer» Solution :(i) Rb (Z= 37), (ii) CA (Z = 20 ), (ii) Mn(Z=25), (IV) CE(Z= 58), (v) Rn (Z=86)