# What quantum numbers refer to a 4s orbital?

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The quantum numbers that refer to a 4s orbital are:

- Principal quantum number (n): 4
- Azimuthal quantum number (l): 0
- Magnetic quantum number (m_l): 0
- Spin quantum number (m_s): +1/2 or -1/2

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The quantum numbers that refer to a 4s orbital are:

- Principal quantum number (n): (n = 4)
- Azimuthal quantum number (l): (l = 0)
- Magnetic quantum number (m_l): (m_l = 0)
- Spin quantum number (m_s): It can have two possible values, (m_s = +\frac{1}{2}) or (m_s = -\frac{1}{2}), representing the two possible spin orientations of electrons.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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