Give the values of the four quantum numbers of an electron in the following orbitals: (a) 3s, (b) 4p, (c) 3d.
(a)

Interpretation:
The values of the quantum numbers associated with the given orbitals should be identified using the concept of quantum numbers.
Concept Introduction:
Each electron in an atom is described by four different quantum numbers. The first three (n, l, ml) specify the particular orbital of interest, and the fourth (ms) specifies how many electrons can occupy that orbital.
Principal Quantum Number (n)
The principal quantum number (n) assigns the size of the orbital and specifies the energy of an electron. If the value of n is larger, then the average distance of an electron in the orbital from the nucleus will be greater. Therefore the size of the orbital is large. The principal quantum numbers have the integral values of 1, 2, 3 and so forth and it corresponds to the quantum number in Bohr’s model of the hydrogen atom. If all orbitals have the same value of ‘n’, they are said to be in the same shell (level). The total number of orbitals for a given n value is n2. As the value of ‘n’ increases, the energy of the electron also increases.
Angular Momentum Quantum Number (l)
The angular momentum quantum number (l) explains the shape of the atomic orbital. The values of l are integers which depend on the value of the principal quantum number, n. For a given value of n, the possible values of l range are from 0 to n − 1. If n = 1, there is only one possible value of l (l=0). If n = 2, there are two values of l: 0 and 1. If n = 3, there are three values of l: 0, 1, and 2. The value of l is selected by the letters s, p, d, and f. If l = 0, we have an s orbital; if l = 1, we have a p orbital; if l = 2, we have a d orbital and finally if l = 3, we have a f orbital. A collection of orbitals with the same value of n is called a shell. One or more orbitals with the same n and l values are referred to a subshell (sublevel). The value of l also has a slight effect on the energy of the subshell; the energy of the subshell increases with l (s < p < d < f).
Magnetic Quantum Number (ml)
The magnetic quantum number (ml) explains the orientation of the orbital in space. The value of ml depends on the value of l in a subshell. This number divides the subshell into individual orbitals which hold the electrons. For a certain value of l, there are (2l + 1) integral values of ml which is explained as follows:
ml = ‒ l, ..., 0, ..., +l
If l = 0, there is only one possible value of ml: 0.
If l = 1, then there are three values of ml: −1, 0, and +1.
If l = 2, there are five values of ml, namely, −2, −1, 0, +1, and +2.
If l = 3, there are seven values of ml, namely, −3, −2, −1, 0, +1, +2, and +3, and so on.
The number of ml values indicates the number of orbitals in a subshell with a particular l value. Therefore, each ml value refers to a different orbital.
Electron Spin Quantum Number (ms)
It specifies the orientation of the spin axis of an electron. An electron can spin in only one of two directions. There are two possible ways to represent ms values. They are +½ and ‒½. One electron spins in the clockwise direction. Another electron spins in the anticlockwise direction. But, no two electrons should have the same spin quantum number.
To find: Get the values of the quantum numbers (n, l, ml, ms) associated with the given orbital (a) 3s
Get the values of the quantum numbers ‘n’, ‘l’ in (a)
Answer to Problem 7.54QP
The values of the quantum numbers (n, l, ml, ms) associated with the given orbital 3s is (3, 0, 0, ±½) (a).
Explanation of Solution
The integer at the beginning of the orbital designation is n. Hence, n in the given orbital, 3s is 3. The letter in orbital designation gives the value of ‘s’. For subshell ‘s’, the possible value of ‘l’ is 0.
Find the values of ‘ml’ and ‘ms’
For l = 0, ml values are from ‒ l, ..., 0, ..., +l. So, 0 is resulted. There are two possible ways to represent ms values. They are +½ and ‒½. One electron is given in upward direction. Another electron is given in the downward direction. But, no two electrons should have the same spin quantum number. Hence the values of ‘ms’ for 3s orbital is ±½. Therefore, the values of the quantum numbers (n, l, ml, ms) associated with the given orbital 3s is (3, 0, 0, ±½).
(b)

Interpretation:
The values of the quantum numbers associated with the given orbitals should be identified using the concept of quantum numbers.
Concept Introduction:
Each electron in an atom is described by four different quantum numbers. The first three (n, l, ml) specify the particular orbital of interest, and the fourth (ms) specifies how many electrons can occupy that orbital.
Principal Quantum Number (n)
The principal quantum number (n) assigns the size of the orbital and specifies the energy of an electron. If the value of n is larger, then the average distance of an electron in the orbital from the nucleus will be greater. Therefore the size of the orbital is large. The principal quantum numbers have the integral values of 1, 2, 3 and so forth and it corresponds to the quantum number in Bohr’s model of the hydrogen atom. If all orbitals have the same value of ‘n’, they are said to be in the same shell (level). The total number of orbitals for a given n value is n2. As the value of ‘n’ increases, the energy of the electron also increases.
Angular Momentum Quantum Number (l)
The angular momentum quantum number (l) explains the shape of the atomic orbital. The values of l are integers which depend on the value of the principal quantum number, n. For a given value of n, the possible values of l range are from 0 to n − 1. If n = 1, there is only one possible value of l (l=0). If n = 2, there are two values of l: 0 and 1. If n = 3, there are three values of l: 0, 1, and 2. The value of l is selected by the letters s, p, d, and f. If l = 0, we have an s orbital; if l = 1, we have a p orbital; if l = 2, we have a d orbital and finally if l = 3, we have a f orbital. A collection of orbitals with the same value of n is called a shell. One or more orbitals with the same n and l values are referred to a subshell (sublevel). The value of l also has a slight effect on the energy of the subshell; the energy of the subshell increases with l (s < p < d < f).
Magnetic Quantum Number (ml)
The magnetic quantum number (ml) explains the orientation of the orbital in space. The value of ml depends on the value of l in a subshell. This number divides the subshell into individual orbitals which hold the electrons. For a certain value of l, there are (2l + 1) integral values of ml which is explained as follows:
ml = ‒ l, ..., 0, ..., +l
If l = 0, there is only one possible value of ml: 0.
If l = 1, then there are three values of ml: −1, 0, and +1.
If l = 2, there are five values of ml, namely, −2, −1, 0, +1, and +2.
If l = 3, there are seven values of ml, namely, −3, −2, −1, 0, +1, +2, and +3, and so on.
The number of ml values indicates the number of orbitals in a subshell with a particular l value. Therefore, each ml value refers to a different orbital.
Electron Spin Quantum Number (ms)
It specifies the orientation of the spin axis of an electron. An electron can spin in only one of two directions. There are two possible ways to represent ms values. They are +½ and ‒½. One electron spins in the clockwise direction. Another electron spins in the anticlockwise direction. But, no two electrons should have the same spin quantum number.
To find: Get the values of the quantum numbers (n, l, ml, ms) associated with the given orbital (b) 4p
Get the values of the quantum numbers ‘n’, ‘l’ in (b)
Answer to Problem 7.54QP
The values of the quantum numbers (n, l, ml, ms) associated with the given orbital 4p is (4, 1, (‒1, 0, +1), ±½) (b).
Explanation of Solution
The integer at the beginning of the orbital designation is n. Hence, n in the given orbital, 4p is 4. The letter in orbital designation gives the value of ‘l’. For subshell ‘p’, the possible value of ‘l’ is 1.
Find the values of ‘ml’ and ‘ms’
For l = 1, ml values are from ‒ l, ..., 0, ..., +l. So, ‒1, 0 and +1 are resulted. There are two possible ways to represent ms values. They are +½ and ‒½. One electron is given in upward direction. Another electron is given in the downward direction. But, no two electrons should have the same spin quantum number. Hence the values of ‘ms’ for 2p orbital is ±½. Therefore, the values of the quantum numbers (n, l, ml, ms) associated with 4p is (4, 1, (‒1, 0, +1), ±½).
(c)

Interpretation:
The values of the quantum numbers associated with the given orbitals should be identified using the concept of quantum numbers.
Concept Introduction:
Each electron in an atom is described by four different quantum numbers. The first three (n, l, ml) specify the particular orbital of interest, and the fourth (ms) specifies how many electrons can occupy that orbital.
Principal Quantum Number (n)
The principal quantum number (n) assigns the size of the orbital and specifies the energy of an electron. If the value of n is larger, then the average distance of an electron in the orbital from the nucleus will be greater. Therefore the size of the orbital is large. The principal quantum numbers have the integral values of 1, 2, 3 and so forth and it corresponds to the quantum number in Bohr’s model of the hydrogen atom. If all orbitals have the same value of ‘n’, they are said to be in the same shell (level). The total number of orbitals for a given n value is n2. As the value of ‘n’ increases, the energy of the electron also increases.
Angular Momentum Quantum Number (l)
The angular momentum quantum number (l) explains the shape of the atomic orbital. The values of l are integers which depend on the value of the principal quantum number, n. For a given value of n, the possible values of l range are from 0 to n − 1. If n = 1, there is only one possible value of l (l=0). If n = 2, there are two values of l: 0 and 1. If n = 3, there are three values of l: 0, 1, and 2. The value of l is selected by the letters s, p, d, and f. If l = 0, we have an s orbital; if l = 1, we have a p orbital; if l = 2, we have a d orbital and finally if l = 3, we have a f orbital. A collection of orbitals with the same value of n is called a shell. One or more orbitals with the same n and l values are referred to a subshell (sublevel). The value of l also has a slight effect on the energy of the subshell; the energy of the subshell increases with l (s < p < d < f).
Magnetic Quantum Number (ml)
The magnetic quantum number (ml) explains the orientation of the orbital in space. The value of ml depends on the value of l in a subshell. This number divides the subshell into individual orbitals which hold the electrons. For a certain value of l, there are (2l + 1) integral values of ml which is explained as follows:
ml = ‒ l, ..., 0, ..., +l
If l = 0, there is only one possible value of ml: 0.
If l = 1, then there are three values of ml: −1, 0, and +1.
If l = 2, there are five values of ml, namely, −2, −1, 0, +1, and +2.
If l = 3, there are seven values of ml, namely, −3, −2, −1, 0, +1, +2, and +3, and so on.
The number of ml values indicates the number of orbitals in a subshell with a particular l value. Therefore, each ml value refers to a different orbital.
Electron Spin Quantum Number (ms)
It specifies the orientation of the spin axis of an electron. An electron can spin in only one of two directions. There are two possible ways to represent ms values. They are +½ and ‒½. One electron spins in the clockwise direction. Another electron spins in the anticlockwise direction. But, no two electrons should have the same spin quantum number.
To find: Get the values of the quantum numbers (n, l, ml, ms) associated with the given orbital (c) 3d
Get the values of the quantum numbers ‘n’, ‘l’ in (c)
Answer to Problem 7.54QP
The values of the quantum numbers (n, l, ml, ms) associated with the given orbital 3d is (3, 2, (‒2, ‒1, 0, +1, +2), ±½) (c).
Explanation of Solution
The integer at the beginning of the orbital designation is n. Hence, n in the given orbital, 3d is 3. The letter in orbital designation gives the value of ‘l’. For subshell ‘d’, the possible value of ‘l’ is 2.
Find the values of ‘ml’ and ‘ms’
For l = 2, ml values are from ‒ l, ..., 0, ..., +l. So, ‒2, ‒1, 0, +1 and +2 values are resulted. There are two possible ways to represent ms values. They are +½ and ‒½. One electron is given in upward direction. Another electron is given in the downward direction. But, no two electrons should have the same spin quantum number. Hence the values of ‘ms’ for 3d orbital is ±½. Therefore, the values of the quantum numbers (n, l, ml, ms) associated with the given orbital 3d is (3, 2, (‒2, ‒1, 0, +1, +2), ±½).
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