Which of the following statements is incorrect?
A) All atoms of an element have the same atomic number.
B) All atoms of an element must have the same mass.
C) All atoms of an element have the same number of electrons.
D) Atoms of an element may have different numbers of neutrons.
Correct Answer:
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Q26: The number of neutrons in an atom
Q28: The total number of subatomic particles (protons,
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Q31: Isotopes of a given element _.
A) have
Q32: The nucleus of atom A contains 20
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