Sulfur exist in S8 form, if it is heated on 1000 K then it converts into form having unpaired number of electrons equal to :

When sulfur (S8) is heated to 1000 K, it breaks down into S2 molecules. Each S2 molecule consists of two sulfur atoms sharing a pair of electrons, forming a covalent bond.

However, sulfur has six electrons in its outermost shell and needs two more to complete its octet. In the S2 molecule, each sulfur atom shares one electron with the other, leaving one unpaired electron in each sulfur atom.

Therefore, each S2 molecule has two unpaired electrons. Since S8 breaks down into four S2 molecules, the total number of unpaired electrons is 4*2 = 8.

So, when S8 is heated to 1000 K, it converts into a form having 8 unpaired electrons.