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A principal quantum number refers to:
a the numbered energy levels starting from the nucleus outward
b the total energy of an electron
c the maximum number of electrons at a given level
d the s, p, d, f levels

Respuesta :

housecalore

Answer:

A

Explanation:

The principal quantum number describes the energy level of an electron (which start at the nucleus and go outward, as stated in the answer choice), so therefore, A is correct.

An example of this is n=1, which describes the first energy level. The elements on this level are Hydrogen and Helium. The principal quantum number also corresponds with the periods of the periodic table.

Answer: a) the numbered energy levels starting from the nucleus outward

Explanation:

Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as [tex]m_l[/tex]. The value of this quantum number ranges from [tex](-l\text{ to }+l)[/tex]. When l = 2, the value of [tex]m_l[/tex] will be -2, -1, 0, +1, +2.

Spin Quantum number : It describes the direction of electron spin. This is represented as [tex]m_s[/tex] The value of this is [tex]+\frac{1}{2}[/tex] for upward spin and [tex]-\frac{1}{2}[/tex] for downward spin.

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