Multiple Choice
How many valence electrons does a silicon (Si) atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following correctly states the number of valence electrons in ICl and describes the arrangement of electrons in its Lewis structure?
A
ICl has 16 valence electrons; the Lewis structure shows a triple bond between I and Cl, with one lone pair on each atom.
B
ICl has 12 valence electrons; the Lewis structure shows a double bond between I and Cl, with two lone pairs on each atom.
C
ICl has 14 valence electrons; the Lewis structure shows a single bond between I and Cl, with three lone pairs on each atom.
D
ICl has 8 valence electrons; the Lewis structure shows a single bond between I and Cl, with two lone pairs on each atom.
Verified step by step guidance1
Determine the number of valence electrons for each atom in ICl. Iodine (I) is in group 17 and has 7 valence electrons, and chlorine (Cl) is also in group 17 with 7 valence electrons.
Add the valence electrons from both atoms to find the total number of valence electrons in the ICl molecule: $7 + 7 = 14$ valence electrons.
Draw a single bond between the iodine and chlorine atoms, which uses 2 electrons from the total valence electrons.
Distribute the remaining electrons as lone pairs to satisfy the octet rule for both atoms. Since 2 electrons are used in the bond, 12 electrons remain to be placed as lone pairs.
Place three lone pairs (6 electrons) on each atom to complete their octets, resulting in a Lewis structure with a single bond between I and Cl and three lone pairs on each atom.
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