Which element commonly has only a proton as its nucleus?
A) helium
B) neon
C) argon
D) hydrogen
E) None of the answers is correct.
Correct Answer:
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Q2: The innermost electron shell in an atom
Q3: The smallest stable units of matter are
A)
Q5: Isotopes of an element differ in the
Q10: The "atomic weight" of an atom reflects
Q12: A(n)_ is a pure substance composed of
Q18: The mass number represents the number of
A)protons
Q18: Which of the following lists contains only
Q19: Atoms of the same element whose nuclei
Q21: If one pair of electrons is unequally
Q22: In a molecule of oxygen gas,two pairs
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