Atoms And The Nucleus
Chemistr I H Unit III
- 1.Which of the following is NOT part of J.J. Thomson's model of an atom?
- A.
His model is compared to plum pudding.
- B.
The positive charge is localized in the center.
- C.
An atom contains negative particles called electrons.
- D.
An atom has its mass distributed nearly uniformly.
- 2.A charged particle that has a large mass is likely to
- A.
Bend very little when passing between plates of different charge
- B.
Bend a lot when passing between plates of different charge
- C.
Pass between charged plates with no deflection
- D.
Stop between charged plates
- 3.How is an atom changed into an ion?
- A.
By losing or gaining electrons
- B.
By losing or gaining neutrons
- C.
By losing or gaining protons
- D.
By ejecting beta particles from the nucleus
- 4.Which of the following is true of gamma radiation?
- A.
It is positively charged.
- B.
It is negatively charged.
- C.
It can be blocked with a piece of paper.
- D.
It is the most penetrating type of radioactivity.
- 5.What is the charge of the nucleus of an oxygen atom?
- A.
6+
- B.
16+
- C.
24+
- D.
8+
- 6.Which of the following is true of Ernest Rutherford's gold foil experiment?
- A.
Very few of the positive particles were greatly deflected back.
- B.
Most of the positive particles were greatly deflected back.
- C.
Most of the positive particles were absorbed by the gold.
- D.
Most of the positive particles dropped to the bottom of the gold foil.
- 7.Isotopes of the same element must have the same number of
- A.
Protons
- B.
Neutrons
- C.
Electrons
- D.
Total particles in the nucleus
- 8.A neutral atom with atomic number 12 and mass number 25 contains
- A.
12 protons, 25 neutrons and 12 electrons
- B.
12 protons, 13 neutrons and 12 electrons
- C.
25 protons, 12 neutrons and 25 electrons
- D.
13 protons, 12 neutrons and 12 electrons
- 9.The mass of a proton is
- A.
Nearly the same as the mass of an electron
- B.
Nearly the same as twice the mass of a neutron
- C.
Nearly the same as the mass of a neutron
- D.
Nearly the mass of an alpha particle
- 10.Atomic masses are assigned relative to
- A.
Carbon-12 atoms
- B.
Oxygen-16 atoms
- C.
Calcium-40 atoms
- D.
Hydrogen-1 atoms
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