Unit 1 Review: Matter, Atoms, and the Periodic Table
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How many energy levels does phosphorus have?
Phosphorous (P) is in period 3, so it has 3 energy levels
How many valence electrons does oxygen have?
Oxygen (O) is in group 16, so it has 6 valence electrons
How many protons does sulfur have?
Sulfur's atomic number is 16, so it has 16 protons
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