A. structure of the atom
B. positive charge of an electron
C. existence of energy level in the atom
D. positive charge on a proton
Correct Answer: Option C
C. existence of energy level in the atom
A. structure of the atom
B. positive charge of an electron
C. existence of energy level in the atom
D. positive charge on a proton
Correct Answer: Option C
C. existence of energy level in the atom
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