![]() Either loss or gain of electrons, the electronic configuration changes to reflect the loss or gain. ![]() Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Element Lead (Pb), Group 14, Atomic Number 82, p-block, Mass 207.2. For example, oxygen ion, 16 8O 2- contains 8 protons and 2 electrons more than the protons (i.e. Lead - Element information, properties and uses Periodic Table. If an atom gains electrons, its number of electrons increases more than the protons by the number of electrons gained, hence it becomes a negatively charged particle called anion, with it number of chargeĮqualing the number of electrons gained. If an atom loses electrons, its number of protons increases more than the electrons by the number of electrons lost, hence, it becomes a positively charged particle called cation – its number of charge equal the number of electrons lost.įor example, 27 13Al 3+ contains 13 protons and 3Įlectrons less than the protons (i.e. Since the mass (27) is equal to number of protons + number of neutrons, then number of neutrons = 27 - 13 = 14.ģ. An atom has equal number of protons and electrons – it is therefore neutral.įor example, aluminium atom, 27 13Al contains 13 protons (atomic number) and 13 electrons. In the case of hydrogen, only a proton and an electron are contained. Namely: protons, electrons, and neutrons. Atoms of all elements except hydrogen contain three particles. ![]() The symbol of an atom can be written to denote its number (number of protons) and its mass number (sum of number of protons and neutrons) as shown: A ZX where X represents the atom, A represents the mass number and Z represents the atomic number.ġ. ![]()
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