Multiple Choice
When iron forms the ionic compound FeCl_3, how many electrons does the iron ion have?
3
views
2. Atoms & Elements
Ions
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple 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.
Related Videos
Related Practice
