Transcript Democritus thought that matter was made of tiny particles

Fun in B208!
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