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- Allotrope [r]: A structural form of a chemical element, a specific configuration of atoms making up the crystalline structure. [e]
- Aluminum [r]: The third most abundant metal on Earth, [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]
- Astatine [r]: A radioactive chemical element with atomic number Z=85. [e]
- Atmosphere [r]: The layers of gas surrounding stars and planets. [e]
- Atom (science) [r]: The defining unit of chemical elements. [e]
- Atomic electron configuration [r]: A specification of the occupation of an atom's electron orbitals by electrons. [e]
- Atomic mass [r]: The mass of an atom expressed in unified atomic mass units (u) and formerly known as atomic weight. [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]: Chemical elements, in one sense of the term, refers to species or types of atoms and, in another sense of the term, refers to chemical pure substances each composed of atoms solely of a single species or type. [e]
- Chemistry [r]: The science of matter, or of the electrical or electrostatical interactions of matter. [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]: A chemical element, having the chemical symbol Ge, and atomic number (the number of protons) 32. [e]
- Gold [r]: Chemical element 79, a lustrous corrosion-resistant precious metal used for money, electronics and jewelry. [e]
- Halogen [r]: Nonmetallic elements in Group 17 of the periodic table: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). [e]
- Helium [r]: A chemical element, having the chemical symbol Atomic number/Atomic symbol, and atomic number (the number of protons) Atomic number/Atomic number. [e]
- Hydrogen-like atom [r]: An atom, excluding hydrogen itself, with only one electron, having charge +(Z-1), where Z = atomic number. [e]
- Hydrogen [r]: The most abundant and lightest chemical element which has atomic number Z = 1 and chemical symbol H. [e]
- IUPAC nomenclature of organic chemistry [r]: A systematic way of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC). [e]
- Intermolecular forces [r]: Non-covalent forces between atoms and molecules; often synonymous with Van der Waals forces. [e]
- Iridium [r]: A very hard, brittle, silvery-white transition metal and chemical element with atomic number 77, and is represented by the symbol Ir. [e]
- Iron [r]: An important transition metal and chemical element with the symbol Fe (Latin: ferrum) and atomic number 26. [e]
- Isotope [r]: An atom of a chemical element with a specific number of neutrons and hence a specific nuclear mass, such as carbon-14 (14C). [e]
- John Dalton [r]: English pioneer chemist and meteorologist (1766-1844), formulated the first quantitative atomic theory. [e]
- Krypton [r]: A chemical element, having the chemical symbol Li, and atomic number (the number of protons) 3. [e]
- LITTLE BOY (nuclear weapon) [r]: Code name for the first nuclear weapon used in warfare, dropped on Hiroshima, Japan, on August 6, 1945. [e]
- Lead [r]: Chemical element number 82, a corrosion-resistant, dense, ductile heavy metal known to cause neurological problems. [e]
- Lithium [r]: A chemical element, having the chemical symbol Li, and atomic number (the number of protons) 3. [e]
- Magnesium [r]: The metallic element that has atomic number 12 and belongs to alkaline earth metal group. [e]
- Manganese [r]: A chemical element, having the chemical symbol Mn, and atomic number (the number of protons) 25. [e]
- Molecular Hamiltonian [r]: Quantum mechanical operator describing the energy associated with motions and interactions of the electrons and nuclei that constitute a molecule. [e]
- Molybdenum [r]: A chemical element, having the chemical symbol Mo, and atomic number (the number of protons) 42. [e]
- Neon [r]: A chemical element, having the chemical symbol Ne, and atomic number (the number of protons) 10. [e]
- Neptunium [r]: A chemical element, having the chemical symbol Atomic number/Atomic symbol, and atomic number (the number of protons) Atomic number/Atomic number. [e]
- Nickel [r]: A chemical element, having the chemical symbol Ni, and atomic number (the number of protons) 28. [e]
- Niobium [r]: A chemical element, having the chemical symbol Nb, and atomic number (the number of protons) 41. [e]
- Nitrogen [r]: a chemical element, symbolized by N, whose individual atoms comprise a nucleus of seven protons, i.e,., it has an atomic number, Z = 7. [e]
- Nuclear fission [r]: The process by which a suitable isotope of an element with a higher atomic number absorbs a neutron, producing two or more lower-numbered nuclei and a large release of energy [e]
- Oxygen [r]: A chemical element with the symbol O and atomic number 8. [e]
- Pencil [r]: An instrument used for writing or drawing and which employs a dry medium, typically a compound based on graphite. [e]
- Periodic Table of Elements [r]: A tabular method of displaying the chemical elements. [e]
- Phosphorus [r]: Chemical element (Z=15) vital to life and widely used in fertilizers, detergents and pesticides. [e]
- Physical chemistry [r]: The application of physics to macroscopic, microscopic, atomic, subatomic, and particulate phenomena in chemical systems within the field of chemistry traditionally using the principles, practices and concepts of thermodynamics, quantum chemistry, statistical mechanics and kinetics. [e]
- Polonium [r]: A rare and highly unstable radioactive metalloid with the symbol Po and atomic number 84. [e]
- Potassium [r]: A very reactive, silvery white alkali metal, chemical element 19 with symbol K. [e]
- Radioactivity [r]: The property of the unstable nuclei of chemical elements to decay into another isotope, emitting energy or particles [e]
- Radiochemistry [r]: The chemistry of radioactive materials [e]
- Rubidium [r]: A chemical element, having the chemical symbol Rb, and atomic number (the number of protons) 37. [e]
- Russell-Saunders coupling [r]: A coupling scheme of electronic spin- and orbital-angular momenta in atomic spectroscopy. [e]
- Scandium [r]: A silvery-white metallic transition metal, with symbol Sc and atomic number 21. [e]
- Selenium [r]: A chemical element, having the chemical symbol Se, and atomic number (the number of protons) 34. [e]
- Silicon [r]: A chemical element, having the chemical symbol Si, and atomic number (the number of protons) 14. [e]
- Silver [r]: A metallic element with the periodic symbol Ag; a precious metal. [e]
- Sodium [r]: A soft, silvery white, highly reactive element which has the symbol Na and atomic number 11. [e]
- Strontium [r]: A chemical element, having the chemical symbol Sr, and atomic number (the number of protons) 38. [e]
- Sulfur [r]: A yellowish crystalline chemical element with the symbol S and the atomic number of 16. [e]
- Sulphur [r]: A chemical element, having the chemical symbol S, and atomic number (the number of protons) 16. [e]
- Technetium [r]: A synthetic chemical element, having the chemical symbol Tc, and atomic number (the number of protons) 43. [e]
- Titanium [r]: A chemical element, having the chemical symbol Ti, and atomic number (the number of protons) 22. [e]
- Unobtanium [r]: A supposed element created by colfrission with phlogiston while suspended in the ether, according to undiscovered alchemical documents supposedly in a cave in France. [e]
- Uranium [r]: A silvery-white metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. [e]
- Vandium [r]: A chemical element, having the chemical symbol Li, and atomic number (the number of protons) 3. [e]
- Yttrium [r]: A chemical element, having the chemical symbol Y, and atomic number (the number of protons) 39. [e]
- Zinc [r]: A chemical element, having the chemical symbol Zn, and atomic number (the number of protons) 30. [e]
- Zirconium [r]: A chemical element, having the chemical symbol Zr, and atomic number (the number of protons) 40. [e]
