Unit 1B Atoms: Question Preview (ID: 26935)


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Compared to the Carbon-12 isotope, the Carbon-14 isotope has
a) more protons and fewer neutrons b) more neutrons and fewer protons c) the same number of protons but more neutrons d) the same number of neutrons but more protons
The charge and location of neutrons in an atom are, respectively,
a) 0 and outside the nucleus b) 0 and in the nucleus c) -1 and outside the nucleus d) -1 and in the nucleus
A sodium atom has a mass number of 24. How many neutrons does it have? (Hint: figure out the number of protons using the periodic table)
a) 11 b) 12 c) 13 d) 14
An atom has 27 protons and 35 neutrons. Its mass number is
a) 27 b) 35 c) 62 d) cannot be determined
For an atom to be neutral it must have
a) more protons than electrons b) fewer protons than electrons c) an equal number of protons and neutrons d) an equal number of protons and electrons
It has 20 protons and 18 electrons. The element is ___ and it has a charge of ___. (hint: use your periodic table)
a) sodium; -2 b) oxygen; -2 c) magnesium; +2 d) calcium; +2
The atomic number identifies the element. The atomic number is the number of ____ in the nucleus of its atoms.
a) protons b) neutrons c) electrons d) charges
Isotopes of an element have the same number of __ but a different number of __.
a) neutrons; electrons b) electrons; protons c) protons; neutrons d) neutrons; protons
Mass number is the number of
a) protons only b) protons plus neutrons c) protons plus electrons d) neutrons plus electrons
The charge on an ion can be calculated as
a) protons minus neutrons b) neutrons minus electrons c) protons minus electrons d) electrons minus neutrons
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