Atomic Number

∞ generated and posted on 2016.12.18 ∞

The number of protons associated with an atom.

Elements are differentiated in terms of their Atomic Numbers since number of electrons but not number of protons can vary with ionization.

Figure legend: Shown are hydrogen (H), carbon (C), nitrogen (N), oxygen (O), sodium (Na), magnesium (Mg), phosphorus (P), sulfur (S), chlorine (Cl), and potassium (K) along with their associated atomic numbers.