How many protons does a chlorine atom have?

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Study for the NOVA Hunting the Elements Test. Dive deep into the secrets of the periodic table with engaging flashcards and multiple-choice questions, each crafted with hints and explanations. Unlock the mysteries of elements and ace your exam!

Multiple Choice

How many protons does a chlorine atom have?

Explanation:
Protons determine an element’s identity; the number of protons equals the atomic number. Chlorine has an atomic number of 17, so there are 17 protons in its nucleus. This count stays the same across isotopes (chlorine-35, chlorine-37, etc.), while the number of neutrons changes. In a neutral atom, there would also be 17 electrons. So the correct number of protons is 17.

Protons determine an element’s identity; the number of protons equals the atomic number. Chlorine has an atomic number of 17, so there are 17 protons in its nucleus. This count stays the same across isotopes (chlorine-35, chlorine-37, etc.), while the number of neutrons changes. In a neutral atom, there would also be 17 electrons. So the correct number of protons is 17.

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