The 13th group element having highest IP1 is Boron .Which element of this group is having IP1 next to Boron
Atomic radius….B<Ga<Al<In<Tl;
IP1…..B>Tl>Ga>Al>In;
MP…B>Al>Tl>In>Ga;
Boron has gaint polymeric structure,Gallium exists as Ga2 molecule(M.P = 302 K)
BP….B>Al>Ga>In>Tl:
Difference in B.P and M.P in Gallium is about 2300 K. It has wide liquid range.It is athermometric liquid.
Density…B<Al<Ga<In<Tl;
EN…B>Tl>In>Ga>Al;
is most -ve for Al and +ve for Tl;