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

Which of the following best describes the given molecular orbital diagram?

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 .......... .

During the conversion of peroxide ion $(O_2^{2-})$ to superoxide ion $(O_2^-)$,an electron is removed from which of the following molecular orbitals?

$A$ molecule which contains unpaired electrons is

Which one is paramagnetic and has the bond order $1/2$?