Midterm Review: Atomic Unit 3 Question Preview (ID: 23071)


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How many electrons are in Na-23
a) 11
b) 12
c) 23
d) 10

How many neutrons are in Br-80
a) 45
b) 80
c) 35
d) 79

What is the nuclear charge of Mg-24?
a) 12
b) 24
c) 13
d) 0

Light is produced when electrons
a) move from a higher energy level to a lower energy level
b) move from a lower energy level to a higher energy level
c) are lost
d) are gained

Carbon-14 and Carbon-12 have the
a) same number of protons different number of neutrons
b) same number of protons different number of electrons
c) same number of neutrons different number of protons
d) same number of neutrons different number of electrons

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) passed through the foil
b) remains trapped in the foil
c) were deflected by the nuclei in the gold foil
d) were deflected by the electrons in the gold atom

Which subatomic particles are located in the nucleus of a carbon atom?
a) protons and neutrons
b) protons only
c) protons and electrons
d) neutrons only

the mass of a proton is equal to the mass of a
a) neutron
b) electrons
c) nucleus
d) orbital

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 excited state
b) a positive ion
c) a negative ion
d) an atom in the ground state

which particle has no charge
a) electron
b) proton
c) neutron
d) positron

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