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Why does the number of valence electrons increase as you move across a period in the periodic table?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons are present in a neutral atom of chlorine?
A
7
B
1
C
8
D
5
Guida verificata passo dopo passo1
Identify the element in question, which is chlorine (Cl).
Determine the atomic number of chlorine, which is 17, meaning it has 17 electrons in a neutral atom.
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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