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Author Quiz
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1

The first part of an atom to be discovered was the
A)proton.
B)neutron.
C)electron.
D)nucleus.
2

The electron was discovered through experiments with
A)electricity.
B)light.
C)radio waves.
D)radioactivity.
3

The nucleus was discovered through experiments with
A)electricity.
B)light.
C)radio waves.
D)radioactivity.
4

Most of the volume of an atom is occupied by
A)electrons.
B)protons.
C)neutrons.
D)empty space.
5

The atomic number of an atom identifies the number of
A)protons.
B)neutrons.
C)quantum orbits.
D)excited states.
6

Isotopes are atoms of an element with identical chemical properties but with different
A)numbers of protons.
B)masses.
C)numbers of electrons.
D)atomic numbers.
7

The masses of all isotopes are based on a comparison to the mass of a particular isotope of
A)hydrogen.
B)carbon.
C)oxygen.
D)uranium.
8

The sum of the number of protons and neutrons in the nucleus of an atom is called the
A)atomic number.
B)atomic mass.
C)atomic weight.
D)mass number.
9

The weighted average of the masses of the stable isotopes of an element as they occur in nature is called the
A)atomic number.
B)atomic mass.
C)atomic weight.
D)mass number.
10

Each family, or group of elements in a vertical column of the periodic table, has elements with chemical characteristics that are
A)exactly the same.
B)similar.
C)different.
D)exactly opposite.





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