Democritus thought that matter was made of tiny particles
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Transcript Democritus thought that matter was made of tiny particles
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Test review Chapter 4
Democritus thought that matter
was made of tiny particles
a. of earth, air, fire, and water.
b. that could not be divided.
c. that could be divided.
d. that were all round and smooth.
Which of the following is NOT part
of John Dalton’s atomic theory?
a. All elements are composed of atoms.
b. All atoms of the same element have the
same mass.
c. Atoms contain subatomic particles.
d. A compound contains atoms of more
than one element.
John Dalton’s model of the
atom states
a. a tiny, solid sphere with an unpredictable
mass for a given element
b. a hollow sphere with a dense nucleus
c. a tiny, solid sphere with predictable mass
for a given element
d. a sphere that is hollow throughout
J.J. Thomson’s experiments
proved that an atom
a. is the smallest particle of matter.
b. has a negative charge.
c. contains negatively charged particles.
d. has a positive charge.
In Rutherfords experiment, what
caused some of the alpha
particles to bounce straight back
from the gold foil?
a. electrons in the gold atoms
b. other alpha particles
c. negative charges in the gold atoms
d. nuclei in the gold atoms
In Niels Bohr’s model of the
atom, electrons move
a. like balls rolling down a hill.
b. like popcorn in a popcorn popper.
c. like planets orbiting the sun.
d. like beach balls on water waves.
Bohr’s model has _______ move
in fixed orbits around the nucleus.
A. neutrons
B. electrons
C. protons
D. atomic mass number
Which subatomic particle has a
negative charge?
a. electron
b. neutron
c. alpha particle
d. proton
Which statement about
subatomic particles is true?
a. Protons, neutrons, and electrons all have
about the same mass.
b. Unlike protons or neutrons, electrons
have no mass.
c. Neutrons have no charge and no mass.
d. An electron has far less mass than either
a proton or neutron.
Which of the following is unique
for any given element?
a. the number of neutrons
b. the number of protons
c. the charge on the electrons
d. the mass of a neutron
The number of protons in one atom
of an element is that element’s
a. mass number.
b. atomic number.
c. balanced charge.
d. isotope.
To find the number of neutrons
in an atom, you would subtract
a. mass number from atomic number.
b. atomic number from electron number.
c. atomic number from mass number.
d. isotope number from atomic number.
The nuclei of isotopes contain
different numbers of _________.
A. neutrons
B. electrons
C. protons
D. atomic mass number
The atomic number refers to the
number of _____ in an atom.
A. neutrons
B. electrons
C. protons
D. atomic mass number
The atomic mass refers to the
number of _____&_____ .
A. neutrons
B. electrons
C. protons
D. atomic mass number
Complete the table.
Protons
Sodium - 24
Lithium - 7
Aluminum - 27
11
3
13
Neutrons Electrons
13
4
14
11
3
13