The diagram below shows part of the skeleton of the periodic table ini which elements are indicated by letters which are not their usual symbols.

Answer the following on the basis of modern periodic table:
(I) Alkali metal(s)
(II) an elements with the outer configuration of `d^(8)s^(2)`
(III) Lanthanoids
(IV) Elements with incomplete f-subshell
(VI) Halogen(s)
(VII) s-block element(s)
(VIII) transition element(s)
(IX) Noble gas (s)
(X) Non-transtion element(s)

Answer

A, B, C