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Ch.7 - Quantum-Mechanical Model of the Atom
Chapter 7, Problem 81

Suppose that in an alternate universe, the possible values of l are the integer values from 0 to n (instead of 0 to n - 1). Assuming no other differences between this imaginary universe and ours, how many orbitals would exist in each level? a. n = 1 b. n = 2 c. n = 3

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insert step 1> Identify the given problem: We need to determine the number of orbitals for each principal quantum number (n) in an alternate universe where the azimuthal quantum number (l) ranges from 0 to n.
insert step 2> Understand the concept: In our universe, for a given n, l ranges from 0 to n-1, and the number of orbitals is given by the sum of (2l + 1) for each l.
insert step 3> Apply the alternate universe rule: In this universe, l ranges from 0 to n, so we need to calculate the sum of (2l + 1) for l = 0 to n.
insert step 4> Calculate the number of orbitals for each n: a. For n = 1, calculate the sum of (2l + 1) for l = 0 to 1. b. For n = 2, calculate the sum of (2l + 1) for l = 0 to 2. c. For n = 3, calculate the sum of (2l + 1) for l = 0 to 3.
insert step 5> Summarize the results: The number of orbitals for each level n in this alternate universe is the total sum calculated in the previous step for each respective n.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Quantum Numbers

Quantum numbers are sets of numerical values that describe the unique quantum state of an electron in an atom. The principal quantum number (n) indicates the energy level, while the azimuthal quantum number (l) defines the shape of the orbital. In this scenario, l can take values from 0 to n, which alters the number of orbitals available at each energy level.
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Orbital Types

Orbitals are regions in an atom where there is a high probability of finding electrons. Each type of orbital (s, p, d, f) corresponds to different values of l. In the given question, the modification of l's range affects the types and number of orbitals, as each value of l corresponds to a specific orbital type.
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Counting Orbitals

The total number of orbitals in a given energy level can be determined by the values of l. In the standard model, for each principal quantum number n, the possible values of l range from 0 to n-1. However, in this alternate universe, l ranges from 0 to n, which means that for each n, there will be n+1 orbitals, changing the total count compared to our universe.
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