1s2 2s2 2p6 3s2 3p3 - phosphorous has vacant 3d orbitals that can be used in bonding - 'expanded valence shell ... in terms of lower electronegativity so positive oxidation states more likely.

Bismuth is in Group 15 of the periodic table. The s, d and f orbitals are all full, but the p orbitals contain three out of a ...

they are found in 6 th period in periodic table. At room temperature all lanthanides ... (b) It has completely filled s-and p-orbitals and a partially filled d-orbital. (c) It has completely ...