<span>Soot is created when burning happens incompletely, because there was an insufficient amount of oxygen supplied. As soot is made from carbon particles, the chemical symbol will be C, for carbon.</span>
The first two ionization energy of nickel are expressed as: Ni(g) = Ni^+(g) + e^- Ni^+(g) = Ni^2+(g) + e^- IOnization energy os the energy that is neccessary in order to remove one mole of electrons from an atom. Hope this helps.