P' block element consists of metals , non-metals and noble gases:- Which are the two allotropic forms of S that have `S_8` units in the structure?

Some elements in p-block shows allotropy. What are the allotropic forms of sulphur?

s and p block elements are called

Hydrogen reacts with most of the metals and non metals to form hydrides. Elements in which one of the following group/groups of the perodic table do not form hydrdes?

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 general cheracteristics of a particular block of elements is as given: They are highly electropositive, soft metals. They are good reducing agents. They lose the outermost electron(s) readily to form 1+ ion of 2+ ion. a) Which block has this general characteristics? b) Writedowntwo general of p-block

d- block elements belong to groups 3-12 in the periodic table, in which the d-orbitals are progressively filled What is misch-metal?

a) Which is the element among alkali metals having lowest ionization enthalpy? b) What is meant by valence of an element? How it varies in the periodic table?