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The Atom
The Atom
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1
Carbon-14 is different from carbon-12 in that it has a different number of
neutrons
protons
electrons
all the above
2
J. J. Thomson discovered the existence of the
neutron
atom
proton
electron
3
This subatomic particle is the smallest of these three subatomic particles
electron
neutron
proton
4
What is J. J. Thomson’s atomic model called?
the nuclear model
the quantum-mechanical model
the Saturnian model
the plum pudding model
5
This subatomic particle has a charge of +1e
neutron
proton
electron
6
Which of the following is
not
a reason that the Bohr model is still in widespread use today?
It is still the most workable model to date
It remains useful for showing how chemical bonding works
It s easier to visualize than more recent models
It is fairly simple and easy to understand
7
This subatomic particle has a charge of –1e.
proton
electron
neutron
8
This subatomic particle is found in the nucleus and has no electrical charge
electron
proton
neutron
9
The quantity of this subatomic particle in an atom of a substance determines the atom’s identity
electron
proton
neutron
10
What is the currently accepted model of the atom?
the nuclear model
the subatomic model
the Bohr model
the quantum-mechanical model
11
The __ is about 1836 times the mass of an electron. The more massive __ is about 1838 times the mass of an electron
proton; neutron
neutron; proton
anion; cation
cation; anion
12
An anion has more __________ than __________.
electrons; protons
electrons; neutrons
protons; electrons
neutrons; protons
13
Which of the following is a weighted average?
atomic mass
atomic number
mass number
none of the above
14
Rutherford’s gold foil experiments gave rise to which atomic model?
the quantum-mechanical model
the plum pudding model
the nuclear model
the Saturnian model
15
Quantum mechanics is a branch of physics that deals with
laws of motion
gravitational force and magnetic fields
classical physics
matter and energy at atomic and subatomic levels
16
The law of electrostatic charges states that
opposite electric charges attract each other
like electric charges repel each other
neither are true
both are true
17
This subatomic particle is the most massive of these three subatomic particles
proton
neutron
electron
18
Which of the following is not a way that an ion can be formed?
All the above lead to ion formation
An atom can lose a neutron
An atom can lose electrons
An atom can gain extra electrons
