AP Chemistry Exam Unit 1 Practice Test 2026

How many protons, neutrons and electrons are present in a neutral atom of the isotope written as ⁴⁰₂₀Ca?

20 protons, 20 neutrons, 20 electrons 20 protons, 40 neutrons, 20 electrons 40 protons, 20 neutrons, 40 electrons 20 protons, 20 neutrons, 18 electrons

Correct Answer:

20 protons, 20 neutrons, 20 electrons

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