Multiple Choice
Which of the following is the correct method to determine the number of valence electrons in a neutral atom of an element?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons does a chlorine atom have?
A
5
B
6
C
8
D
7
Verified step by step guidance1
Identify the element in question, which is chlorine (Cl).
Determine the atomic number of chlorine, which is 17, meaning it has 17 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of chlorine: $1s^2 2s^2 2p^6 3s^2 3p^5$.
Count the electrons in the outermost shell (the third shell): $3s^2$ and $3p^5$ add up to $2 + 5 = 7$ valence electrons.
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