Gallium is _____ block element.

Which of the following is/are wrong statements? a) Alkali metals, alkaline earth metals and helium are s-block elements. b) Pnicogens and halogens are p-block elements. c) The first member of the lanthanide series is lanthanum. d) The lightest liquid metal is gallium. e) Group 17 contains no metals. f) Elements whose atoms have two outermost shells incomplete are called transition elements

In case of d-block elements

Transition elements are d - block elements and inner transition elements are f-block elements. What is Lanthanoid Contraction?