Multiple Choice
Which of the following atoms or ions is NOT isoelectronic with the others?
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Table of contents
- 1. Intro to General Chemistry3h 48m
- Classification of Matter18m
- Physical & Chemical Changes19m
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- 2. Atoms & Elements4h 16m
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- 23. Chemistry of the Nonmetals2h 39m
- Main Group Elements: Bonding Types4m
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- 24. Transition Metals and Coordination Compounds3h 16m
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- Ligands10m
- Complex Ions5m
- Coordination Complexes7m
- Classification of Ligands11m
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- Crystal Field Theory Summary8m
- Magnetic Properties of Complex Ions9m
- Strong-Field vs Weak-Field Ligands6m
- 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 protons are present in an ion that has 18 electrons and a -1 charge?
A
16
B
18
C
17
D
19
Verified step by step guidance1
Understand that the number of protons in an atom or ion is equal to its atomic number, which defines the element.
Recall that the charge of an ion is given by the difference between the number of protons and electrons: $\text{Charge} = \text{Protons} - \text{Electrons}$.
Given the ion has 18 electrons and a charge of -1, set up the equation: $-1 = \text{Protons} - 18$.
Solve for the number of protons: $\text{Protons} = -1 + 18$.
Interpret the result to identify the number of protons in the ion.
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