Multiple Choice
How many total valence electrons are present in a molecule of CO_2?
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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 krypton (Kr) have?
A
8
B
4
C
6
D
2
Verified step by step guidance1
Identify the position of krypton (Kr) on the periodic table. Krypton is a noble gas located in Group 18 (or Group 8A) of the periodic table.
Recall that the group number for main-group elements corresponds to the number of valence electrons. For Group 18 elements, the valence shell is fully filled.
Determine the electron configuration of krypton to confirm the valence electrons. Krypton's electron configuration ends with 4s\^2 3d\^{10} 4p\^6, indicating the outermost shell is the 4th shell.
Count the electrons in the outermost shell (n=4), which includes the 4s and 4p orbitals. The 4s orbital has 2 electrons and the 4p orbital has 6 electrons, totaling 8 valence electrons.
Conclude that krypton has 8 valence electrons, consistent with its position as a noble gas with a full outer shell.
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