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Subatomic
Particles
Early Scientists
Atomic
Theories
Isotopes
Misc.
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This is the charge of an
electron.
What is negative?
These two subatomic
particles have
almost the same
mass.
What are protons and
neutrons?
When an atom gains or
looses energy, some of
these may move between
energy levels.
What are electrons?
The atomic number
depends on the number
of this subatomic
particle.
What is a proton?
The number of this
subatomic particle
makes the difference
between isotopes.
What is a neutron?
Aristotle thought that
matter was made of
these four things.
What is earth, air, fire,
and water?
This man provided evidence
for the existence of a
nucleus in an atom?
Who is Ernest
Rutherford?
J.J. Thomson’s
experiment provided
evidence that an atom
contains this.
What are negatively
charged particles
(electrons).
Since the alpha particle
was rebounded during
the gold foil experiment,
this was determined to
be in the center of an
atom and have a positive
charge.
What is the nucleus
(containing protons)?
Dalton, in his atomic
theory, stated that all
atoms of an element are
identical. This did not
allow the existence of
these.
What are Isotopes?
This is what Bohr’s and
Rutherford’s atomic
models have in common.
What is a central
nucleus (or a large
volume of empty space)?
The modern Atomic
Theory differs from
Dalton’s in that we now
know that atoms can be
_____.
What is subdivided (broken
down into subatomic
particles)?
Democritus theory of
how matter was made up
created this word
describing something
that could not be
divided.
What is an atom.
James Chadwick’s contribution to
the modern atomic theory included
his discovery of this subatomic
particle.
What are neutrons?
J.J. Thomson’s model of
negatively charged
particles distributed
throughout an overall
positive charge is called
this.
What is the chocolate
chip ice-cream model (or
the plum pudding
model)?
This is the sum of the
protons and neutrons in
an atom.
What is mass number?
Isotopes of the same
element have different
numbers of these.
What are neutrons?
Mass number is the sum
of these two things.
What are the number of
protons and the number of
neutrons?
If an atom of tin has a
mass number of 118 and
an atomic number of 50,
this is the number of
neutrons in the nucleus.
What is 68?
If an atom has a mass
number of 95 and
contains 50 neutrons,
this is the atomic
number of the element.
What is the atomic
number of 45?
Between protons and
electrons, this
subatomic particle has
much less mass.
What is an electron?
This is the number of
protons in an atom of an
element.
What is the atomic
number?
If and element has 11
protons in the nucleus,
this will also be 11.
What is the atomic
number?
In Bohr’s model of the
atom, these move in
fixed orbits around the
nucleus.
What are electrons?
This is the difference
between an electron
orbital and an electron
cloud.
What is an orbital is a
fixed path and a cloud is
an area where an
electron is probably
located.