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**Hint:**The electron is the subatomic particle with a one-electron charge that is negative. Electrons are the first generation of the lepton particle family, and since they have no known components or substructure, they are considered elementary particles.

**Complete answer:**

Quantum numbers are a series of numbers that define the position and energy of an electron in an atom. There are four quantum numbers in the universe.

The principal quantum number \[\left( n \right)\] is one of the four quantum numbers used to describe the state of an electron in an atom. It is a discrete variable since its values are real numbers. The azimuthal quantum number \[\left( l \right)\] , the magnetic quantum number \[\left( {{m_l}} \right)\] , and the spin quantum number \[\left( s \right)\] are the other quantum numbers for bound electrons, in addition to the principal quantum number. They explain an electron's special quantum state when put together.

The azimuthal quantum number is the quantum number that defines the shape of an atomic orbital and determines its orbital angular momentum. It is the second of many quantum numbers that characterize an electron's unique quantum state.

The magnetic quantum number is used to measure the azimuthal portion of an orbital's orientation in space and to differentiate the orbitals available inside a subshell.

The \[\left( {n + l} \right)\] value, not the \[m\] value, determines the energy of an electron. An electron in the \[2{p_y}\] orbital has the same energy as those in the \[2{p_x}\] and \[2{p_z}\] orbitals. There are degenerate orbitals.

**So, the answer is Option D.**

**Note:**

Quantum numbers define the values of a quantum system's conserved quantities. Remember that when the principal and azimuthal quantum numbers of orbitals are the same, they have the same energy.

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