Unit Two Review Question Preview (ID: 42966)


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The mass of an electron is
a) smaller than the mass of a proton.
b) smaller than the mass of a neutron.
c) a tiny fraction of the mass of an atom.
d) all of the above.

One atomic mass unit is ___.
a) 1/12 the mass of a carbon-12 atom.
b) 1/16 the mass of an oxygen-16 atom
c) exactly the mass of one proton
d) approximately the mass of one proton plus one neutron.

The atomic mass of an atom is usually not a whole number because it accounts for
a) only the relative abundance of the atom’s isotopes.
b) only the mass of each of the atom’s isotopes.
c) the mass of the atom’s electrons.
d) both the relative abundance and the mass of each of the atom’s isotopes.

How many valence electrons does a chlorine atom have if its electron configuration is 1s2 2s2 2p6 3s2 3p5?
a) 3
b) 21
c) 5
d) 7

What is the charge of an atom?
a) positive
b) negative
c) neutral
d)

What is the charge of the nucleus of an atom?
a) positive
b) negative
c) neutral
d)

The number of protons and electrons changes between isotopes of a given element.
a) True
b) False
c)
d)

Which statement is false?
a) Protons have a positive charge.
b) Electrons are negative and have a mass of 1 amu.
c) The nucleus is positively charged.
d) The neutron is found in the nucleus of the atom.

Which of the following is the configuration for iron?
a) 1s2-2s2-2p6-3s2-3p2
b) 1s2-2s2-2p6-3s2-3p6-4s2-3d6
c) 1s2-2s2-2p6-3s2-3p6-4s2-3d10-4p6-5s2-4d1
d)

You do not need to know how many isotopes there are when determining the atomic mass of an element.
a) True
b) False
c)
d)

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