What is the approximate mass of an ion that has 12 protons, 13 neutrons, and 10 electrons?
- Mayya Alocci
- Jun 6
- 1 min read
Regents Chemistry Exam January 2025 Question 31
31 What is the approximate mass of an ion that has 12 protons, 13 neutrons, and 10 electrons?
(1) 22 u (3) 25 u
(2) 23 u (4) 35 u
Solution:
Mass is equal to the number of protons plus the number of neutrons. Mass = 12+13=25. Choice 3 is the correct answer.
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