In which period is the atom with the expanded octet? period 1 O period 4 period 3 O period 2 How many electrons are in the valence energy level of the atom with the expanded octet? number of electrons:

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Q: Can you help me step by step with number 9 part A, part B, part C? Can you explain it to me?

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A: The question is asking to verify the equivalence between the units of energy, calorie and joule.