An element X has atomic number 17 and mass number 35. Which of the following correctly describes a neutral atom of X?

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Question

An element X has atomic number 17 and mass number 35. Which of the following correctly describes a neutral atom of X?

Accepted Answer

B) 17 protons, 18 neutrons, 17 electrons — Atomic number 17 means 17 protons. In a neutral atom, electrons = protons = 17. Neutrons = mass number − atomic number = 35 − 17 = 18. Option A incorrectly gives 18 electrons, suggesting a charged ion.

Answer

A) 17 protons, 17 neutrons, 18 electrons

Answer

C) 18 protons, 17 neutrons, 17 electrons

Answer

D) 17 protons, 35 neutrons, 17 electrons

Answer

B) 17 protons, 18 neutrons, 17 electrons

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