Oxygen, O, (number 8), sulfur, S, (number 16), and selenium, Se, (number 34) have such similar chemical properties because
A. they all have the same number of occupied shells.
B. their outermost shells contain the same number of electrons.
C. they are all located close to one another in the periodic table.
D. These elements can't have similar chemical properties because they are in different periods of the periodic table.
Answer: B
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