Multiple Choice
Which of the following are the very small particles that make up matter?
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- 1. Intro to General Chemistry3h 29m
- Physical & Chemical Changes19m
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- The Alkyl Groups9m
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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
- Coordination Numbers & Geometry9m
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- Intro to Crystal Field Theory10m
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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
The Atom
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the mass number for an atom of xenon containing 54 protons and 75 neutrons?
A
54
B
19
C
75
D
129
Verified step by step guidance1
Identify the number of protons and neutrons given in the problem. Here, the atom has 54 protons and 75 neutrons.
Recall that the mass number (A) of an atom is the total number of protons and neutrons in its nucleus.
Write the formula for the mass number: \(A = Z + N\), where \(Z\) is the number of protons and \(N\) is the number of neutrons.
Substitute the given values into the formula: \(A = 54 + 75\).
Add the numbers to find the mass number, which represents the total nucleons in the atom.
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