An atom with 16 protons must be: a. oxygen b. selenium c. sulfur d. can't tell

C. Sulfur

Is the answer.

your answer is sulfur because the atomic number is the same as protons!

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.