Answer:
The answer is 1.
Explanation:
Four quantum numbers are used to describe an electron:
n is the Principal quantum number which deals with its energy state,
l is the Azimuthal quantum number which describes its angular momentum,
m or ml is the Magnetic quantum number which relates to magnetic,
s or ms is the Spin quantum number which covers spin.
Each electron is unique in its set of quantum numbers. So there can only be one.
Only one electron in an atom can have the quantum numbers; n = 4, l = 0, ml = 0, ms = + 1/2.
According to Pauli exclusion theory, no two electrons in an atom can have the same value for all the four quantum numbers. Even if two electrons are present in the same orbital, the values of their spin quantum number must differ in obedience to Pauli exclusion theory.
Therefore, only one electron in an atom can have the quantum numbers; n = 4, l = 0, ml = 0, ms = + 1/2.
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