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- 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]
- Atomic electron configuration [r]: A specification of the occupation of an atom's electron orbitals by electrons. [e]
- Atomic number [r]: The number of protons in the nucleus of a single atom of a chemical element. [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]: 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 Periodic Table of Elements/Atomic symbol, and atomic number (the number of protons) Periodic Table of Elements/Atomic number. [e]
- Hydrogen [r]: The most abundant and lightest chemical element which has atomic number Z = 1 and chemical symbol H. [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]
- Krypton [r]: A chemical element, having the chemical symbol Li, and atomic number (the number of protons) 3. [e]
- Lead [r]: Chemical element number 82, a corrosion-resistant, dense, ductile heavy metal known to cause neurological problems. [e]
- Life [r]: Living systems, of which biologists seek the commonalities distinguishing them from nonliving systems. [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]
- Mass [r]: The total amount of a substance, or alternatively, the total energy of a substance. [e]
- Methane [r]: A chemical compound and alkane with the molecular formula CH4, and the principal component of natural gas. [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 Periodic Table of Elements/Atomic symbol, and atomic number (the number of protons) Periodic Table of Elements/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]
- Oxygen [r]: A chemical element with the symbol O and atomic number 8. [e]
- Phosphorus [r]: Chemical element (Z=15) vital to life and widely used in fertilizers, detergents and pesticides. [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]
- Rubidium [r]: A chemical element, having the chemical symbol Rb, and atomic number (the number of protons) 37. [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]
- 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]
