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Multiple Choice
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1

Which of the following cannot be broken down to anything simpler?
A)water
B)table salt
C)silver
D)sugar
2

Elements combine in fixed mass ratios to form compounds. This must mean that elements
A)are made up of continuous matter without subunits.
B)are composed of discrete units called atoms.
C)have unambiguous atomic numbers.
D)are always chemically active.
3

The first part of an atom to be discovered was the
A)proton.
B)neutron.
C)electron.
D)nucleus.
4

The electron was discovered through experiments with
A)electricity.
B)light.
C)radio waves.
D)radioactivity.
5

The nucleus was discovered through experiments with
A)electricity.
B)light.
C)radio waves.
D)radioactivity.
6

The planetary model of an atom, with the nucleus playing the role of the Sun and the electrons playing the role of planets, is unacceptable because
A)the electrical attraction between a proton and an electron is too weak.
B)an electron is accelerating and would lose energy.
C)the nuclear attraction between a proton and an electron is too strong.
D)none of these because the planetary model is acceptable.
7

Most of the volume of an atom is occupied by
A)electrons.
B)protons.
C)neutrons.
D)empty space
8

The atomic number of an atom identifies the number of
A)protons.
B)neutrons.
C)quantum orbits.
D)excited states.
9

The Bohr model of the atom was able to explain the Balmer series because
A)larger orbits required electrons to have more negative energy in order to match the angular momentum.
B)differences between the energy levels of the orbits matched the difference between energy levels of the line spectra.
C)electrons were allowed to exist only in allowed orbits and nowhere else.
D)none of the above.
10

The idea of matter waves, as reasoned by de Broglie, describes a wavelike behavior of any
A)particle, moving or not.
B)particle that is moving.
C)charged particle that is moving.
D)particle that is stationary.
11

How many naturally occurring elements are found on the earth in significant quantities?
A)115
B)92
C)89
D)26
12

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.
13

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.
14

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.
15

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.
16

The modern periodic law is based on
A)atomic number.
B)atomic mass.
C)atomic weight.
D)chemical activity.
17

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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