Multiple Choice
Krypton has 8 valence electrons. What is true about krypton?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which element has 7 valence electrons in its 5th energy level?
A
Tellurium (Te)
B
Bromine (Br)
C
Xenon (Xe)
D
Iodine (I)
Verified step by step guidance1
Identify the principal energy level (shell) in question, which is the 5th energy level (n=5). This corresponds to the 5th row (period) in the periodic table.
Recall that valence electrons are the electrons in the outermost shell (highest principal quantum number) of an atom.
Determine which element in the 5th period has 7 valence electrons. The number of valence electrons corresponds to the group number for main group elements (Groups 1, 2, and 13-18).
Look at the periodic table and find the element in period 5 with 7 valence electrons. Elements in Group 17 (halogens) have 7 valence electrons.
Identify the element in period 5, group 17, which is Iodine (I). Therefore, Iodine has 7 valence electrons in its 5th energy level.
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