The orbital that allows no more than two electrons is the s orbital. This is a spherical shaped orbital. Elements with valence electrons lying only in the s orbital are metals.
The s orbital is the one that can be occupied by no more than two electrons. All the other orbitals can also be occupied by at least two electrons.
Electrons are negatively charged and repel each other. The presence of a maximum of 2 electrons in one orbital is itself surprising. The reason for this is that the two electrons have opposite spins which enables this.
Was it Pauli? I'm not positive.
Each orbital in an atom can hold no more than two electrons, and they must be opposed in spin.
Any orbital can have no electrons at minimum and two electrons at maximum.
Each orbital can hold a maximum of two electrons.
The S orbital contains a maximum of two electrons
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.
Be (beryllium) has four electrons total: the first orbital, the 1s orbital, has two, which leaves two electrons in the outer shell.
Similarly to a bonding orbital, there would be two electrons at most in an anti-bonding orbital.