Electron (Electron) e-rae-Jung, symbols and have very little mass.' Proton charge + symbol p is positive and there is a greater mass Electron (almost 2000 times)' There is a battery symbol n neutron and Proton have more mass as. Atomic number and mass number, Atomic symbols.1. the number of protons in nucleus is called the atomic number (atomic number, Z).2. the sum of the number of protons, neutron mass number are called with (mass number, A).A = Z + N, where N is the number of neutron.(Mass number is a whole number and the atomic mass of nearby). Writing the nuclear symbol.(A) above, to the left of the element symbol.(Z) below, to the left of the element symbol.X = the symbol of the element.
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