AnswersPhysical ScienceAtoms and the Periodic Table

Practice Test Answers

11 verified answers
1
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What error did Mimi make?

A
The changes to atomic number are reversed.
B
The changes to the nucleus are reversed.
C
No change in mass number occurs in beta minus decay.
D
A proton is released in beta plus decay.
2
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What experimental evidence led to the development of this atomic model from the one before it?

A
Cathode rays were bent in the same way whenever a magnet was brought near them.
B
Equations were used to identify regions around the nucleus where electrons would likely be.
C
Experiments with water vapor showed that elements combine in specific proportions.
D
A few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil.
3

What best explains how they should complete the table?

A
with “Outside the nucleus,” because the particle is an electron
B
with “Outside the nucleus,” because the particle is a proton
C
with “Inside the nucleus,” because the particle is a neutron
D
with “Inside the nucleus,” because the particle is a proton
4

What is the atomic number of this atom?

A
6
B
8
C
9
D
16
5

What surprising result is explained using this model?

A
A few positive particles bounced back because they were pushed away from the positive center.
B
A few positive particles bounced back because they bounced off of the net formed by the ovals.
C
Most positive particles passed through because of the empty space between the outer edge and the center.
D
Most positive particles passed through because they were attracted by the small particles moving around the center.
6

Which best describes nuclear fusion?

A
A nucleus spontaneously splits and absorbs energy.
B
A nucleus collides with a neutron and splits, releasing energy.
C
Nuclei combine to form a heavier nucleus, releasing energy.
D
Two nuclei spontaneously combine and absorb energy.
8

Who was the first chemist to organize elements by atomic number?

A
John Newlands
B
Henry Moseley
C
Antoine Lavoisier
D
Johann Wolfgang Döbereiner
9

An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?

A
0
B
24
C
28
D
52
10

What is an atomic nucleus?

A
the outer part of an atom in which neutrons move
B
the central part of an atom, composed of protons and electrons
C
the central part of an atom, composed of protons and neutrons
D
the outer part of an atom in which electrons move
11

Seven-eighths of a sample of hydrogen-3 will have become a stable isotope after 36 point 9 years. What is the half-life of hydrogen-3?

A
32 point 3 years
B
12 point 3 years
C
18 point 5 years
D
36 point 9 years
12

Which type of reaction does this diagram represent?

A
a decrease in energy that is caused by nuclear fission
B
a chain reaction that is caused by nuclear fusion
C
an increase in energy that is caused by nuclear fusion
D
a chain reaction that is caused by nuclear fission

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