Multiple Choice
When a sodium atom loses one electron, it becomes positively charged. What is the correct name and symbol for this ion?
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- 1. Intro to General Chemistry3h 48m
- Classification of Matter18m
- Physical & Chemical Changes19m
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- Crystal Field Theory Summary8m
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- Magnetic Properties of Complex Ions: Octahedral Complexes11m
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
How many electrons are present in an O^{2-} ion?
A
8
B
12
C
10
D
6
Verified step by step guidance1
Identify the atomic number of oxygen (O), which is the number of protons in the nucleus. For oxygen, the atomic number is 8.
Understand that a neutral oxygen atom has the same number of electrons as protons, so it has 8 electrons.
Recognize that the ion given is O^{2-}, which means the oxygen atom has gained 2 extra electrons.
Calculate the total number of electrons by adding the 2 extra electrons to the original 8 electrons: $8 + 2$.
Conclude that the O^{2-} ion has 10 electrons in total.
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