A(n) ________ is a pure substance composed of atoms.
A) element
B) compound
C) molecule
D) electron
E) neutron
Correct Answer:
Verified
Q3: The smallest stable units of matter are
A)
Q5: Isotopes of an element differ in the
Q7: By weight, which element is the second
Q7: Oxygen is required in biological systems for
A)cellular
Q10: The "atomic weight" of an atom reflects
Q11: If an isotope of oxygen has 8
Q15: The mass of an atom is largely
Q17: Which element commonly has only a proton
Q18: The "atomic number" of an atom is
Q18: The mass number represents the number of
A)protons
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