1. Answe a. What is the difference
models of Thomson and Rutherford?
b. What is meant by valency of an element?
What is the relationship between the
number of valence electron and valency?
c. What is meant by atomic mass
number ? Explain how the atomic
number and mass number of carbon are
6.
6 and 12 respectively
d. What is meant by subatomic
particle? Give brief information of three
subatomic particles with reference to
electrical charge, mass and location.
Give scientifi​

1. Thomson’s model of atom does not contain any details about nucleus but Rutherfords model explains the nucleus of an atom

B. Valency is the combing power of an element. Elements in the same group on a periodic table have the same valency(how many electrons on the outer shell)

C.Atomic mass is the mass of a single atom of the chemical element, its equivalent to the number of protons and neutrons in the atom(the mass number)

Carbon is an atom made up of 12 it contains 6 protons and 6 neutrons :)

Subatomic particle