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Atoms: Journey Through Time
Test Description: Please answer the review questions.
Instructions: Answer all questions to get your test result.
1) Dalton's atomic theory includes which idea?
A
Atoms of the same element are always identical.
B
Atoms of different elements always combine in one-to-one ratios
C
Individual atoms can be seen with a microscope.
D
All atoms of all elements are the same size.
2) What particles form the nucleus of an atom?
A
protons and neutrons
B
protons, neutrons, and electrons
C
protons and electrons
D
neutrons and electrons
3) Which statement about the discovery of electrons is true?
A
Electrons were discovered in a vacuum tube.
B
Electrons were discovered when an electric current was passed through gases at low pressures.
C
Electrons were discovered after the TV tube was invented.
D
Electrons were discovered by experimental chemists.
4) Which of the following is correct concerning subatomic particles?
A
The neutron was discovered by Chadwick in 1932
B
Cathode rays were found to be made of protons.
C
The electron was discovered by Goldstein in 1886.
D
The proton was discovered by Thomson in 1880.
5) Select the correct statement about subatomic particles.
A
The mass of a neutron nearly equals the mass of a proton.
B
Neutrons have no charge and are the lightest subatomic particle.
C
Electrons are negatively charged and are the heaviest subatomic particle.
D
Protons are positively charged and are the lightest subatomic particle
6) The atomic number of an element is the total number of which atomic particles?
A
Protons, electrons, and neutrons
B
Electrons
C
Neutrons
D
Protons
7) The mass number of an element is equal to
A
a constant number for the lighter elements.
B
the sum of the protons and neutrons.
C
less than twice the atomic number.
D
the total number of electrons.
8) How is the number of neutrons in the nucleus of an atom calculated?
A
Add the mass number to the number of electrons.
B
Add the number of electrons and protons together.
C
Subtract the number of electrons from the number of protons
D
Subtract the number of protons from the mass number.
9) An element has an atomic number of 30. How many protons and electrons are in a neutral atom of the element?
A
30 protons, 0 electrons
B
30 protons, 30 electrons
C
15 protons, 15 electrons
D
60 protons, 30 electrons
10) Using the periodic table, determine the number of neutrons in carbon.
A
6
B
2
C
18
D
12
*select an answer for all questions
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