Table of contents

10. Periodic Properties of the Elements

Valence Electrons of Elements

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Multiple Choice

How many valence electrons does a fluorine atom have?

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Identify the element in question, which is fluorine (F).

Determine the atomic number of fluorine, which is 9, meaning it has 9 electrons in total.

Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.

Write the electron configuration of fluorine: $1s^2 2s^2 2p^5$.

Count the electrons in the outermost shell (the second shell): $2s^2$ and $2p^5$ add up to $2 + 5 = 7$ valence electrons.

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