Pick out the statements which suits to f block elements. a. All of them are naturally occurring elements. b. Uranium and Thorium are f block elements. c. Last electrons is filled in the shell pre-ceding the outermost shell. d. last electrons are filled up in the antepenultimate shell. e. Includes some radioactive elements. f. Some of them are used as catalyst in petroleum industry.

Last electron in f-block elements goes to: Which sub-shell? Outer f-subshell Penultimate f-subshell/Anitepenulti mate f-subskell.

Choose the correct statement which is suitable to f block elements. a. The last electrons are filled up in the antipenultimate shell. b. High electronegativity. c. Used as a fuel in nuclear reactors. d. Can form coloured compounds. e. Uses as a catalyst in petroleum production. f. Show various oxidation states.

The elements in which the last electron enters into the p-orbitals of their outer-most shell are called p-blocks elements:- Name two allotrops of sulphur.

Last electron in f-block elements goes to: Which shell? Outer shell/PenuItimate shell /Antepenultimate shell

Assess the properties of elements and classify it as p and d block elements. • form coloured compounds • includes metals and non-mentals. •show various oxidation states. • The last electrons are filled in the outermost shell. • show similar properties, in periods. •The last electrons are filled in the shell preceding the outermost shell. •Only metals are included.

The elements in which the last electron enters into the p-orbitals of their outer-most shell are called p-blocks elements:- Give a method for the preparation of phosphine.

The last electron of an element is filled in the 3d^2 subshell. Then find the following. a) Atomic number b) Group, period Block

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

Choose the correct statement from the following. a) Zn is the least reactive element. b) 17^th group elements are called halogens. c) All shells possess d subshells. d) f block elements are known as transition elements.