Find the values of n, l, m, and s for the 9th electron

The values of all four quantum number for 9th electron are:

n = 2

l = 1

m = 3

s = + 1/2

Explanation:

There are four quantum numbers:

Principal quantum number (n)

Azimuthal quantum number (l)

Magnetic quantum number (ml)

Spin quantum number (ms)

All these four quantum numbers gives complete information about an electron like its spin, shells, subshells and orbitals.

For example:

The all four quantum values for 9th electron are:

It is the last electron of fluorine;

F₉ = 1s², 2s², 2p⁵

The last 9th electron is in second orbital the principle quantum number will be 2.

Azimuthal quantum number (l)

The azimuthal quantum number describe the shape of orbitals. its value foe s, p, d, f... are 0, 1, 2, 3. For 9th electron its value will be (n-1) 1.

Magnetic quantum number (ml)

It describe the orientation of orbitals. Its values are -l to +l. For l=1  the ml will be -1 ,0,+1.

Spin quantum number (ms)

The spin quantum  number tells the spin of electron either its clock wise (+1/2) or anti clock wise (-1/2).

For last electron of fluorine spin quantum number will be

+1/2 because it occupy full empty 2Pz. If 10th electron will added then its spin will be -1/2.

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