The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quantum numbers. Enter ONE possible value for each quantum number of an electron in the orbital given.
Orbital n l ml ms
1s There are a total of values possible for ml.
2s There are a total of values possible for ml.

See explanation

Explanation:

We can describe electrons using four sets of quantum numbers;

principal quantum number (n)

orbital quantum number (l)

magnetic quantum number (ml)

spin quantum number (ms)

Since no two electrons in an atom can have the same value for all four quantum numbers according to Pauli exclusion theory, for the orbitals given one possible value for each quantum number is shown below;

For 1s-

n = 1, l= 0, ml = 0, ms= 1/2

For 2s-

n= 2, l =0, ml=0, ms=1/2

For 1s and 2s orbitals, there is only one possible value for ml which is zero.

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the answer would be a