Match the following:
part a
1. emitted from a cathode-ray tube
2. discovered the neutron
3. discovered the electron electrons
4. postulated the quantum atom
5. discovered the proton nucleus
6. father of atomic theory
7. location of most of the mass of the atom
part b
a. rutherford
b. bohr
c. dalton
d. chadwick
e. j. j. thomson

Matching of Part A with Part B

Rutherford discovered proton nucleus

Bohrpostulated the quantum atom

DaltonFather of atomic theory

Chadwick discovery of neutron

J.J. Thomsondiscovered the electrons

hence , the matching will be

 2 -- d                        

 3 -- e                  

 4 -- b                  

 5 -- a                  

 6 -- c                  

the answer is 12 as i may remember

: )