ЦТ Chemistry Practice Questions - ЦТ ЦЭ Chemistry (Belarus Centralized Testing Centralized Exam) Exam

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Naturally occurring chlorine consists of two stable isotopes: ³⁵Cl and ³⁷Cl. Which statement correctly compares an atom of ³⁵Cl with an atom of ³⁷Cl?

Both isotopes have 17 protons and 17 electrons, but ³⁷Cl has 20 neutrons while ³⁵Cl has 18 neutrons. ³⁷Cl has 19 protons and 18 neutrons, whereas ³⁵Cl has 17 protons and 18 neutrons. Both isotopes have the same mass number, but ³⁷Cl has a higher atomic number. ³⁵Cl has 17 neutrons and ³⁷Cl has 19 neutrons, but both have 18 electrons.

Correct Answer:

Both isotopes have 17 protons and 17 electrons, but ³⁷Cl has 20 neutrons while ³⁵Cl has 18 neutrons.

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