Multiple Choice
An atom has 14 protons and 15 neutrons. Which element is it (and what is the isotope’s mass number)?
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4. Atoms and Elements
Isotopes
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Which statement best defines a radioactive isotope?
A
An isotope that has the same number of neutrons as protons in its nucleus
B
An isotope that cannot react chemically because its electrons are in a full valence shell
C
An isotope that has a net positive or negative charge due to gaining or losing electrons
D
An isotope with an unstable nucleus that spontaneously decays, emitting radiation
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