Multiple Choice
Which of the following statements accurately describes properties of valence electrons?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following elements has the same number of valence electrons as krypton (Kr)?
A
Argon (Ar)
B
Sodium (Na)
C
Chlorine (Cl)
D
Neon (Ne)
Verified step by step guidance1
Identify the group number of krypton (Kr) in the periodic table. Krypton is a noble gas located in Group 18, which means it has a full outer shell of valence electrons.
Recall that elements in the same group have the same number of valence electrons. Since krypton is in Group 18, it has 8 valence electrons (except helium, which has 2).
Check the valence electrons of each given element by identifying their group numbers: Argon (Ar) is also in Group 18, Sodium (Na) is in Group 1, and Chlorine (Cl) is in Group 17.
Compare the valence electrons of each element to krypton's 8 valence electrons. Argon, being in Group 18, also has 8 valence electrons, while Sodium has 1 and Chlorine has 7.
Conclude that the element with the same number of valence electrons as krypton is Argon (Ar), not Neon (Ne), which is also a noble gas with 8 valence electrons but was not listed as an option.
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