Pauli - it is the Pauli exclusion principal.
The two arrows with a single block of an orbital diagram must be written in opposing directions because the electrons are said to be rotating in opposite directions. This means the two electrons in the orbital are spinning on their axis in opposite ways.
There are two electrons at most in an orbital, further, they have spins in opposed directions.
When you fill an orbital the electrons must spin in opposite directions. This results in no two electrons having the same quantum number, a result defined as the Pauli Exclusion Principle. You can have 2 electrons in an orbital. Note that 2py 2px and 2pz are three different orbitals.
There can only be 2 electrons in each single orbital, and they will be on opposite sides of the electron cloud (orbital).
The are two electrons in the 3s orbital of magnesium (Mg.)
An orbital pair refers to two electrons occupying the same orbital within an atom. These electrons have opposite spins as required by the Pauli exclusion principle. Orbitals can accommodate a maximum of two electrons with opposite spins.
Spin
According to the Pauli exclusion principle, electrons in the same orbital must have opposite spins. This is because each orbital can hold a maximum of two electrons with opposite spins to minimize their mutual repulsion. Pairing electrons with opposite spins helps to stabilize the atom's overall energy.
Electrons can occupy the same orbital if they have opposite spin. Spin is a quantum property of particles that can be described as either "up" or "down." The Pauli exclusion principle states that no two electrons in an atom can have the same set of quantum numbers, so electrons in the same orbital must have opposite spin.
It depends what type of orbital these two electrons occupy. But there would be one arrow going up and one arrow going down to show two electrons in the same orbital.
they have opposite spin
Each orbital can hold a maximum of 2 electrons, with opposite spins according to the Pauli exclusion principle.