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1. The smallest particle that can still be considered an element is the ___ a) molecule b) atom c) cell d) proton
b
2. Dalton thought atoms were ___ a) charged b) smooth and hard balls c) soft d) made of energy
b
3. Who discovered the electron a) Rutherford b) Thomson c) Bohr d) Dalton
b
4. Thomson’s model is also known as the ___ a) planetary model b) nuclear model c) plum pudding model d) orbit model
c
5. Rutherford’s experiment led to the discovery of the ___ a) neutron b) proton c) nucleus d) electron
c
6. What is found in the center of the atom a) nucleus b) electron cloud c) neutron d) proton
a
7. The proton has a ___ charge a) positive b) negative c) neutral d) mixed
a
8. The electron has a ___ charge a) positive b) negative c) neutral d) double
b
9. The neutron has ___ charge a) positive b) negative c) no d) both
c
10. Bohr’s model described electrons moving ___ a) randomly b) in specific orbits c) in straight lines d) only inside the nucleus
b
11. The modern model shows electrons moving in a ___ a) fixed path b) cloudlike region c) ring d) sphere
b
12. Who discovered the nucleus a) Dalton b) Rutherford c) Bohr d) Thomson
b
13. Who discovered the neutron a) Bohr b) Dalton c) James Chadwick d) Thomson
c
14. The nucleus is ___ a) negative b) neutral c) positive d) empty
c
15. Protons and neutrons are found in the ___ a) electron cloud b) nucleus c) orbit d) shell
b
16. Which two particles have about the same mass a) proton and electron b) proton and neutron c) electron and neutron d) atom and proton
b
