(i) Which family of compounds is known as chalcogens and why ?
(ii) Except fluorine, other members of the halogen family show variable oxidation states. Why ?
(iii) Give the shape of `S_(8)` molecule in rhombic sulphur.

Which member of the halogen family (X) does not show oxidation state of +1?

Fluorine does not show variable oxidation states while other members of the halogen family exhibit variable oxidation states. Why ?

Which of the following members of nitrogen family does not show negative oxidation state?

(i) What are transition elements ? (ii) Why do transition elements show variable oxidation states ?

Oxygen exhibits an oxidation state of - 2 while the other members of the family show oxidation states of +2, +4 " and " +6 . Explain.

Fluorine exhibit only – 1 oxidation state whereas other halogens exhibit +ve oxidation states also. Explain why ?

In group 13, Tl (thalium) shows +1 oxidation state while other members show +3 oxidation state, why ?

Why the element of second period shows a number of difference in properties from other members of their respective families?

Give reason for the following : (i) Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows the highest oxidation state of +4 (ii) Transition metals show variable oxidation states. (iii) Actinoids show irregularities in their electronic configurations.