science 3rd

• Atomic Number


  Number of protons that identify the atoms of an element
• Atomic Mass


  Mass of an atom of a particular element; average of the mass numbers of the naturally occurring isotopes of the element multiplied with their respective abundance
• Mass Number


  Sum of the number of protons and the number of neutrons
• Isotopes


  Atoms having the same number of protons but different number of neutrons, identified through their mass number
• Ion


  Atom or group of atoms that has positive or negative charge
• Cation


  Positively-charged ion
• Anion


  Negatively-charged ion