General instructions same as in chapter 1.
Assertion: An atom has equal number of electrons and protons.
Reason:In an atom there are equal number of electrons, protons and neutrons.

Calculate the number of electrons , protons and neutrons in sulphur.

Compare the properties of electron, proton and neutron

Calculate the number of electron, proton and neutron in sulphate ion .

Calculate the number of electron, proton and neutron in phosphate ion .

Calculate the number of electron, proton and neutron in carbonate ion .

Calculate the number of electrons , protons and neutrons in phosphorous atom.

General instructions same as in chapter 1. Assertion:Rydberg's constant varies with mass number of a given element. Resaon:The reduced mass of the electron is dependent on a given element.

Calculate the number of electron, proton and neutron in sulphide ion (S*-2)