Multiple Choice
After drawing the Lewis structure of the nitrite ion (NO_2^-), what is the hybridization of the central nitrogen atom?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Ions
Multiple Choice
Which of the following correctly represents the Lewis dot structure for the strontium oxide ion pair (SrO)?
A
Sr with one dot and O with seven dots, indicating Sr^{+} and O^{-}
B
Sr with two dots and O with six dots (three pairs), indicating neutral atoms
C
Sr with eight dots and O with no dots, indicating Sr^{8-} and O^{8+}
D
Sr with no dots and O with eight dots (four pairs), indicating Sr^{2+} and O^{2-}
Verified step by step guidance1
Step 1: Identify the elements involved and their typical valence electrons. Strontium (Sr) is an alkaline earth metal in Group 2, so it typically has 2 valence electrons. Oxygen (O) is a Group 16 element with 6 valence electrons.
Step 2: Determine the common ionic charges for these elements. Strontium tends to lose 2 electrons to form Sr^{2+}, and oxygen tends to gain 2 electrons to form O^{2-}, achieving noble gas electron configurations.
Step 3: Represent the Lewis dot structures for the neutral atoms first: Sr with 2 dots (representing its 2 valence electrons) and O with 6 dots (3 pairs) around it.
Step 4: Show the transfer of electrons from Sr to O to form ions. Sr loses its 2 valence electrons (no dots remain), becoming Sr^{2+}, and O gains 2 electrons to complete its octet, resulting in 8 dots (4 pairs) around O, indicating O^{2-}.
Step 5: Conclude that the correct Lewis structure for the SrO ion pair is Sr with no dots (Sr^{2+}) and O with eight dots (four pairs) (O^{2-}), reflecting the ionic nature of the compound.
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