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WorksheetsUnit 3: Understanding the Atom
Total questions: 20
Worksheet time: 11mins
Which part of the atom makes up most of its volume?
its electron cloud
its neutrons
its nucleus
its protons
What did Democritus believe an atom was?
a solid, indivisible object
a tiny particle with a nucleus
a nucleus surrounded by an electron cloud
a tiny nucleus with electrons surrounding it
If an ion contains 10 electrons, 12 protons, and 13 neutrons, what is the ion's charge?
2-
1-
2+
3+
J. J Thomson's experimental setup is shown. What is happening to the cathode rays?
They are attracted to the negative plate.
They are attracted to the positive plate.
They are stopped by the plates.
They are unaffected by either plate.
How many neutrons does iron-59 have?
30
33
56
59
Why were Rutherford's students surprised by the results of the gold foil experiment?
They didn't expect the alpha particles to bounce back from the foil.
They didn't expect the alpha particles to continue in a straight path.
They expected only a few alpha particles to bounce back from the foil.
The expected the alpha particles to be deflected by electrons.
Which determines the identity of an element?
its mass number
the charge of the atom
the number of neutrons
the number of protons
What does the figure show?
two different elements
two different ions
two different isotopes
two different protons
How is Bohr's atomic model different from Rutherford's model?
Bohr's model has a nucleus.
Bohr's model has electrons.
Electrons in Bohr's model are located farther from the nucleus.
Electrons in Bohr's model are located in circular levels.
Which best describes an atom?
a particle with a single negative charge
a particle with a single positive charge
the smallest particle that still represents a compound
the smallest particle that still represents an element
What is structure x?
an electron cloud
a neutron
a nucleus
a proton
Which best describes structure x?
most of the atom's mass, neutral charge
most of the atom's mass, positive charge
very small part of the atom's mass, negative charge
very small part of the atom's mass, positive charge
Which is true about the size of an atom?
It can only be seen using a scanning tunneling microscope.
It is about the size of the period at the end of this sentence.
It is large enough to be seen using a magnifying lens.
It is too small to see with any type of microscope.
Whose model for the atom is shown?
Bohr's
Dalton's
Rutherford's
Thomson's
What structure did Rutherford discover?
the atom
the electron
the neutron
the nucleus
Look at the chart. What is the atomic number of particle 3?
3
5
6
11
Which particles are isotopes of the same element?
1 and 2
2 and 3
2 and 4
3 and 4
Which particle is an ion?
1
2
3
4
Why have scientists only recently been able to see atoms?
Atoms are too small to see with ordinary microscopes.
Early experiments disproved the idea of atoms.
Scientists didn't know atoms existed.
Scientists were not looking for atoms.
Nuclear decay occurs when an unstable atomic nucleus changes into another nucleus by emitting ______________.
elements
isotopes
air
radiation
