Multiple Choice
A neutral fluorine atom (F) has atomic number . How many electrons does it contain?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Number of Electrons
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which neutral element has 18 electrons?
A
Argon (Ar)
B
Calcium (Ca)
C
Potassium (K)
D
Chlorine (Cl)
Verified step by step guidance1
Recall that a neutral atom has an equal number of protons and electrons.
Identify the atomic number of each element, which equals the number of protons (and electrons in a neutral atom).
Look up the atomic numbers: Argon (Ar) = 18, Calcium (Ca) = 20, Potassium (K) = 19, Chlorine (Cl) = 17.
Compare the atomic numbers to the given number of electrons (18) to find the matching element.
Conclude that the element with 18 electrons (and thus atomic number 18) is Argon (Ar).
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