Chemistry Past Questions and Answers

A plastic which cannot be softened by heat is described as

Allotropes of an element differ in their

What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?

Given that the electronic configuration of an element X is 1s<sup style='font-size: smaller;'>2</sup>2s<sup style='font-size: smaller;'>2</sup>2p<sup style='font-size: smaller;'>6</sup>3s <sup style='font-size: smaller;'>2</sup>3p<sup style='font-size: smaller;'>4</sup>, it can be deduced that X

P,Q,R and S are metals in the same group in the Periodic Table but in periods 3,4, 5 and 6 respectively which of them loses electrons least readily?