What does the pauli exclusion principle state?

a) electrons will be added to an atom at the lowest possible level or sublevel.

b) an orbital can contain two electrons only if all other orbitals at that sublevel are empty.

c) an orbital can contain two electrons only if all other orbitals at that sublevel contain at least one electron.

d) two electrons occupy the same orbital only if they have opposite spins.

e) an orbital can contain two electrons only if all other orbitals at that sublevel are empty.

Answer : The correct option is, (D) Two electrons occupy the same orbital only if they have opposite spins.

Explanation :

Pauli Exclusion Principle :

Pauli Exclusion Principle states that no two electrons present in an atom or a molecule can have the same set of the four quantum numbers.

It can also stated that, only two electrons may exist in the same orbital and these electrons must have opposite spin.

That means if two electrons have same value of three quantum number i.e, n, l and m but the forth quantum number that is spin quantum number is different for them.

Both the two electrons have opposing spins having value either or .

Hence, the correct option is, (D) Two electrons occupy the same orbital only if they have opposite spins.

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).