no it does not require energy.
charge, atomic radius, orbital penetration, and electron pairing.
the energy is require to remove an electron from an atom (ionization energy) but when electron is absorbed in an atom energy is released (electron affinity) however 2nd electron affinity is endothermic ,energy is require.
This is an electron situated on the outermost level.
The aufbau procedure (filling order of atomic orbitals) is used to work out the electron confiturations of all atoms. However, modification should be made by applying Hund's rule. The aufbau procedure is based on a rough energy levels diagram of many-electron atoms.
Elements on the right side of the periodic table require large amounts of energy to remove an electron from the outermost energy level of their atoms. It is much easier for them to gain rather than lose electrons.
All transitions in which electrons move from a lower to a higher level require a gain of energy. example: 2nd to 3rd shell
The simple answer is that magnetism requires electron pairing which boron does not possess.
Yes it does
10 because there are 20 Valence Electrons that are pairing up.
n=1to n=2
1310 kJ/mol
Yes, the energy of an electron does vary depending on which energy level it occupies.