During the formation of molecular orbitals from atomic orbitals,the electron density .....

The diamagnetic species among the following is $.....$

$A$ homonuclear diatomic gas molecule shows $2$-electron magnetic moment. The one-electron and two-electron reduced species obtained from the above gas molecule can act as both oxidizing and reducing agents. When the gas molecule is one-electron oxidized,the bond length decreases compared to the neutral molecule. The gas molecule is

$He_{2}$ molecule is not possible. Explain.

Oxygen molecule is paramagnetic because

If $x-axis$ is the molecular axis and $p_z$ orbitals participate in bonding,then which one of the following will be the nodal plane present within the $\pi-$ bond of the $O_2$ molecule?