What is the approximate mass of an atom that has 10 electrons, 10 protons, and 9 neutrons?
- Mayya Alocci
- Jan 1, 2023
- 1 min read
Regents Chemistry Exam August 2022
32 What is the approximate mass of an atom that has 10 electrons, 10 protons, and 9 neutrons? (1) 10u
(2) 19u
(3) 20u
(4) 29u
Explanation: The mass of a an atom is equal to the sum of protons and neutrons. 10+9=19
Answer: 2
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