Multiple Choice
How many valence electrons does the element neon (Ne) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does the element argon (Ar) have?
A
4
B
8
C
6
D
2
Verified step by step guidance1
Identify the position of argon (Ar) on the periodic table. Argon is a noble gas located in Group 18 (or Group 8A) of the periodic table.
Recall that the group number for main-group elements indicates the number of valence electrons. For Group 18 elements, the valence shell is full.
Understand that argon has a complete outer shell, which means it has 8 valence electrons, corresponding to a full octet.
Confirm this by writing the electron configuration of argon: $1s^2 2s^2 2p^6 3s^2 3p^6$. The electrons in the outermost shell (3s and 3p orbitals) add up to 8 valence electrons.
Conclude that argon has 8 valence electrons, which explains its chemical inertness and stability.
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