Multiple Choice
Periodic Table: Element Symbols — Which element is a major component of chlorophyll at the center of its porphyrin ring?
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4. Atoms and Elements
Periodic Table: Element Symbols
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Which element has 17 protons in its nucleus?
A
Sulfur (S)
B
Argon (Ar)
C
Potassium (K)
D
Chlorine (Cl)
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