Multiple Choice
When iron forms the ionic compound FeCl_3, how many electrons does the iron ion have?
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2. Atoms & Elements
Ions
Multiple Choice
Which of the following correctly represents the charge and symbol for an oxide ion?
A
O^{2-}
B
O^{+}
C
O^{-}
D
O^{2+}
Verified step by step guidance1
Step 1: Understand that an oxide ion is formed when an oxygen atom gains electrons to achieve a full octet, resulting in a negative charge.
Step 2: Recall that a neutral oxygen atom has 8 protons and 8 electrons. When it gains 2 electrons, the total number of electrons becomes 10, giving it a charge of 2-.
Step 3: Represent the oxide ion symbolically by writing the element symbol 'O' followed by the charge as a superscript. Since the charge is 2-, it is written as \(O^{2-}\).
Step 4: Recognize that the other options (\(O^{+}\), \(O^{-}\), \(O^{2+}\)) represent oxygen ions with positive or different charges, which do not correspond to the oxide ion.
Step 5: Conclude that the correct representation of the oxide ion is \(O^{2-}\), indicating an oxygen ion with a 2- charge.
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