What makes an isotope radioactive?
A) It has more protons than electrons.
B) It releases energy to become stable.
C) It releases hydrogen ions into solution.
D) It breaks down into hydrogen and electrons.
Correct Answer:
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Q8: The smallest unit of matter is the
A)molecule.
B)atom.
C)compound.
D)isotope.
Q9: The atomic mass of a proton is
A)0
Q10: If the atomic number of an element
Q11: Which is characteristic of an ion?
A)Contains an
Q12: Compared to "regular" isotopes,radioactive isotopes
A)emit energy from
Q14: Which of the following subatomic particles are
Q15: Which subatomic particle determines the identity of
Q16: The number of an element is equal
Q17: The number of protons in an atom
Q18: Over 90% of the body is composed
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