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
Multiple Choice
Which element has 17 protons in its nucleus?
A
Sulfur (S)
B
Argon (Ar)
C
Potassium (K)
D
Chlorine (Cl)
Verified step by step guidance1
Recall that the number of protons in the nucleus of an atom defines the element's atomic number.
Identify the atomic number of each element given: Sulfur (S) has atomic number 16, Argon (Ar) has atomic number 18, Potassium (K) has atomic number 19, and Chlorine (Cl) has atomic number 17.
Match the atomic number 17 to the element with 17 protons, which is Chlorine (Cl).
Understand that the atomic number is unique to each element and determines its position on the periodic table.
Therefore, the element with 17 protons in its nucleus is Chlorine (Cl).
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