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Which number indicates the energy level of an atom's valence electrons? O A. The period number O B. The group number O c. The atomic number O D. The mass number
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Which number indicates the energy level of an atom's valence electrons?

O A. The period number
O B. The group number
O c. The atomic number
O D. The mass number

User Jack Woodward
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Answer:A, The Period Number

Step-by-step explanation:

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User Uclajatt
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