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• Alpha particle [r]: helium nucleus; particle of charge 2e and mass 4 u. ^[e]
• Aluminium [r]: The third most abundant metal on Earth ^[e]
• Anion [r]: A chemical ion with a negative charge. Positive ions are called cations. ^[e]
• Argon [r]: A chemical element with atomic number 18. It is an inert gas in group 18 of the modern periodic table. ^[e]
• Arsenic [r]: A chemical element, having the chemical symbol As, and atomic number (the number of protons) 33. ^[e]
• Atomic electron configuration [r]: A specification of the occupation of an atom's electron orbitals by electrons. ^[e]
• Atomic radius [r]: A measure of the size of an atom, usually the distance from the nucleus to the boundary of the surrounding cloud of electrons. ^[e]
• Beryllium [r]: A chemical element, having the chemical symbol Be, and atomic number (the number of protons) 4. ^[e]
• Boron [r]: A rare chemical element (atomic number = 5) present in 0.0003% of the earth's crust, mostly as borax and kernite. ^[e]
• Bromine [r]: A chemical element, having the chemical symbol Br, and atomic number (the number of protons) 35. ^[e]
• Cadmium [r]: A chemical element with the symbol Cd and atomic number 48. ^[e]
• Calcium [r]: The chemical element with the symbol Ca and atomic number 20. ^[e]
• Carbon [r]: Fourth most abundant chemical element in the Universe, with atomic number Z=6. ^[e]
• Chemical elements [r]: In one sense, refers to species or types of atoms, each species/type distinguished by the number of protons in the nuclei of the atoms belonging to the species/type, each species/type having a unique number of nuclear protons; in another sense, refers to substances, or pieces of matter, each composed of multiple atoms solely of a single species/type. ^[e]
• Chlorine [r]: A chemical element, having the chemical symbol Cl, and atomic number (the number of protons) 17. ^[e]
• Chromium [r]: A chemical element, having the chemical symbol Cr, and atomic number (the number of protons) 24. ^[e]
• Cobalt [r]: A hard, lustrous, grey metal, a chemical element with symbol Co and atomic number 27. ^[e]
• Copper [r]: A transition metal chemical element. ^[e]
• Deuterium [r]: An isotope of the chemical element hydrogen containing one proton and one neutron. ^[e]
• Fluorine [r]: A chemical element, having the chemical symbol F, and atomic number (the number of protons) 9. ^[e]
• Gallium [r]: A chemical element, having the chemical symbol Ga, and atomic number (the number of protons) 31. ^[e]
• Germanium [r]: Add brief definition or description
• Gold [r]: Add brief definition or description
• Halogen [r]: Add brief definition or description
• Helium [r]: Add brief definition or description
• Hydrogen [r]: Add brief definition or description
• Iridium [r]: Add brief definition or description
• Iron [r]: Add brief definition or description
• Krypton [r]: Add brief definition or description
• Lead [r]: Add brief definition or description
• Lithium [r]: Add brief definition or description
• Magnesium [r]: Add brief definition or description
• Manganese [r]: Add brief definition or description
• Molybdenum [r]: Add brief definition or description
• Neon [r]: Add brief definition or description
• Neptunium [r]: Add brief definition or description
• Nickel [r]: Add brief definition or description
• Niobium [r]: Add brief definition or description
• Nitrogen [r]: Add brief definition or description
• Oxygen [r]: Add brief definition or description
• Phosphorus [r]: Add brief definition or description
• Polonium [r]: Add brief definition or description
• Potassium [r]: Add brief definition or description
• Rubidium [r]: Add brief definition or description
• Scandium [r]: Add brief definition or description
• Selenium [r]: Add brief definition or description
• Silicon [r]: Add brief definition or description
• Silver [r]: Add brief definition or description
• Sodium [r]: Add brief definition or description
• Strontium [r]: Add brief definition or description
• Sulfur [r]: Add brief definition or description
• Technetium [r]: Add brief definition or description
• Titanium [r]: Add brief definition or description
• Unobtanium [r]: Add brief definition or description
• Uranium [r]: Add brief definition or description
• Vanadium [r]: Add brief definition or description
• Yttrium [r]: Add brief definition or description
• Zinc [r]: Add brief definition or description
• Zirconium [r]: Add brief definition or description