Question

How many of these species are
paramagnetic?
O2,01,07,02, C2,
B2, Be2, L22​

Answer 1

Answer:

the following are paramagnetic:

O2,O2+,O2-,B2

Explanation:

Let us see the electronic configuration of Oxygen=

$1s^{2} 2 {s}^{2} 2 {p}^{2}$

The oxygen atom has 2 unpaired electrons in the 2p orbital si we can say that it is paramagnetic.

Now the O2 2- molecular ions magnetism can be checked by drawing the molecular orbital diagram

As you see the π2pz and π2px have paired no. of electrons. Hence O 2 2− is diamagnetic

O 2− .

O2- π2py has one unpaired electron, hence O2−

is paramagnetic

Both O2+ and O2 has one and two unpaired electrons in their molecular orbitals, which means both the molecules have a net spin and both are paramagnetic

B2 is paramagnetic because it has two unpaired electrons, one in each of its p orbitals. b. C2 is diamagnetic because all of its electrons are paired.

Be2 molecule does not exist, and therefore one cannot classify it as a paramagnetic

Li2 only has 2 electrons. If you draw the MO diagram, they should both be in the sigma 2s bonding orbital. They are both paired, so it is diamagnetic.