The number of species having non-pyramidal shape among the following is ___________.

(A) SO₃

(B) NO$$_3^ - $$

(C) PCl₃

(D) CO$$_3^{2 - }$$

AB₃ is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is __________. (Integer answer)

The total number of electrons in all bonding molecular orbitals of $$O_2^{2 - }$$ is ______________.

(Round off to the nearest integer)

The difference between bond orders of CO and NO$$^ \oplus $$ is $${x \over 2}$$ where x = _____________. (Round off to the Nearest Integer)