In the conversion of $N_2$ into $N_2^+$,the electron will be lost from which of the following molecular orbitals?

Fill in the blanks given below:
$(i)$ The Molecular Orbital Theory was proposed by .......... and .......... scientists.
$(ii)$ The addition of atomic orbitals results in the formation of ............ orbitals.
$(iii)$ The distribution of electrons in molecular orbitals is called .......... .
$(iv)$ The number of bonds between atoms joined by a covalent bond is called .......... .

Arrange the following in the correct order of their bond orders.
$I. N_2, II. O_2, III. O_2^+, IV. O_2^-$

The correct molecular orbital diagram for $F_2$ molecule in the ground state is

According to $MOT$,which of the following is correct?

The bond orders of $He_2^{+}$ and $He_2$ are respectively