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Question
Atoms of an element differ from those of all other elements in
Options:
A .  Atomic number and electronic configuration.
B .  Number of neutrons and number of valence electrons.
C .  Atomic number and number of valence electrons.
D .  Number of neutrons and electronic configuration.
Answer: Option A
Atoms of an element differ from those of all other elements in number of neutrons and electronic configuration.

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