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Midterm Review: Atomic Unit 3
Test Description: Atomic review
Instructions: Answer all questions to get your test result.
1) How many electrons are in Na-23
A
23
B
12
C
10
D
11
2) How many neutrons are in Br-80
A
79
B
35
C
80
D
45
3) What is the nuclear charge of Mg-24?
A
12
B
13
C
24
D
0
4) Light is produced when electrons
A
move from a lower energy level to a higher energy level
B
move from a higher energy level to a lower energy level
C
are lost
D
are gained
5) Carbon-14 and Carbon-12 have the
A
same number of neutrons different number of protons
B
same number of protons different number of electrons
C
same number of protons different number of neutrons
D
same number of neutrons different number of electrons
6) The gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil
A
remains trapped in the foil
B
were deflected by the nuclei in the gold foil
C
passed through the foil
D
were deflected by the electrons in the gold atom
7) Which subatomic particles are located in the nucleus of a carbon atom?
A
protons and electrons
B
protons and neutrons
C
neutrons only
D
protons only
8) the mass of a proton is equal to the mass of a
A
neutron
B
nucleus
C
orbital
D
electrons
9) An electron in a sodium atom gains enough energy, to move from the second shell to the third shell. The sodium atom becomes
A
an atom in the ground state
B
an atom in the excited state
C
a positive ion
D
a negative ion
10) which particle has no charge
A
electron
B
neutron
C
proton
D
positron
*select an answer for all questions
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