Which of trhe following statements is not correct?
A. The first inoisation energies (in ` KJ "mol"^(-1)`) of carbon, silicon , germanium , tin, and lead are 1086, 786,761,708 and 715 respectively:
B. Down the group , electronegativity dereases from B to T1 in boron family.
C. Among oxides of the elements of carbon family CO is neutral , GeO is acidic and SnO is amphoteric.
D. The 4f and 5f inner transition elements are placed seperately at the bottom of the periodic table to maintain its struction.
