Multiple Choice
Oxygen has a total of eight electrons. How many valence electrons does an oxygen atom possess?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following elements has a full valence shell?
A
Na (Sodium)
B
Ne (Neon)
C
O (Oxygen)
D
Cl (Chlorine)
Verified step by step guidance1
Recall that a full valence shell means the outermost electron shell is completely filled with electrons, which typically corresponds to the electron configuration of noble gases.
Identify the group and period of each element to determine their valence electron configuration: Sodium (Na) is in group 1, Oxygen (O) in group 16, Chlorine (Cl) in group 17, and Neon (Ne) is a noble gas in group 18.
Understand that noble gases like Neon have a full valence shell, which for Neon means having 8 electrons in its outermost shell (the octet rule), making it very stable.
Compare the valence electron count of each element: Sodium has 1 valence electron, Oxygen has 6, Chlorine has 7, and Neon has 8, indicating Neon has a full valence shell.
Conclude that Neon (Ne) is the element with a full valence shell because it has a complete octet, unlike the other elements listed.
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