The general electronic configuration of the transition elements is
(n-1)d10, (n+1)s2
(n- 1)d1-10, (n + 1)s1-2
(n- 1)d1-10, np6,ns2
(n- 1)d1-10, ns1-2
Select the coloured compound amongst the following .
(At. no. Ti= 22, Cr= 24, Cu= 29, Zn= 30)
TiCl4
CrCl3
ZnCl3
CuCl
Identify a 'chemical twin' among the following.
Zr-Ta
Nb-Tc
Hf-Re
Nb-Ta
D.
Nb-Ta
Due to lanthanoid contraction on moving down the group, atomic or ionic radii becomes similar. Hence, Nb-Ta have similar atomic radii and called chemical twin.