What is the number of valence electrons in an atom in the ground state with an electron configuration of 2-8-18-3?
- Mayya Alocci
- Jun 10
- 1 min read
Regents Chemistry Exam January 2025 Question 33
33 What is the number of valence electrons in an atom in the ground state with an electron configuration of 2-8-18-3?
(1) 18 (3) 3
(2) 2 (4) 31
Solution:
The number of valence electrons (electrons on the outermost shell) is equal to the last number you see in the electron configuration. Choice 3 is the correct answer.
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