Question

1. the atom is electrically neutral because:

a) protons = neutrons
b) protons = electrons
c) neutrons = electrons
d) mass number = atomic number

1. the electron was discovered by:

a) j.j. thomson
b) rutherford
c) bohr
d) dalton

1. which of the following is electrically neutral?

a) proton
b) neutron
c) electron
d) nucleus

1. the gold foil experiment was conducted by:

a) bohr
b) rutherford
c) chadwick
d) dalton

Explanation:

• For question 6: An atom is neutral because the number of positively - charged protons equals the number of negatively - charged electrons.
• For question 7: J.J. Thomson discovered the electron through cathode - ray tube experiments.
• For question 8: Neutrons have no electric charge, making them electrically neutral. Protons are positive, electrons are negative, and the nucleus is positive due to protons.
• For question 9: Ernest Rutherford conducted the gold foil experiment which led to the discovery of the atomic nucleus.

Answer:

1. b) Protons = Electrons
2. a) J.J. Thomson
3. b) Neutron
4. b) Rutherford