Information about the element, Thorium, atomic number 90. Covers physical properties, atomic properties, how abundant it is on the Earth, where it is found, and details about health-related regulations. Discusses thorium's potential use...

Information about the element, Sulfur, atomic number 16. Covers physical and atomic properties, its history, chemistry, sources, uses, how abundant it is on the Earth, environmental and biological factors, and the different forms in...

Information about the element, Strontium, atomic number 38. Covers its history, sources, physical properties, atomic properties, how abundant it is on the Earth, details about permissible exposure, uses, and possible substitutes.

Information about the element, Sodium, atomic number 11. Covers physical and atomic properties, how abundant it is on the Earth, and human health considerations.

Information about the element, Silver, atomic number 47. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations and effects from exposure to it. Also discusses...

Information about the element, Scandium, atomic number 21. Covers physical properties, atomic properties, how abundant it is on the Earth and where it is found, and details about any impact on human health.

Information about the element, Rubidium, atomic number 37. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations.

Information about the metallic element, Rhenium, atomic number 75. Covers its physical and atomic properties, how abundant it is on the Earth, sources, uses, and potential substitutes.

Information about the radioactive element, Radon, atomic number 86. Covers physical properties, atomic properties, how abundant it is on the Earth, details about its impact on human health, and about how it can be monitored.

Information about the radioactive element, Radium, atomic number 88. Covers physical and atomic properties, how abundant it is on the Earth, and permissible exposure limits.

Basic information about the element Potassium, atomic number 19. Covers its history, physical and atomic properties, and how abundant it is on the Earth.

Information about the element, Platinum, atomic number 78. Covers its physical and atomic properties, how abundant it is on the Earth, sources, uses, potential substitutes, and permissible exposure limits.

Information about the element, Nitrogen, atomic number 14. Covers common chemical transformations, its physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations. Also discusses...

Information about the metallic element, Molybdenum, atomic number 42. It is unique in having an extremely high melting point. Covers its discovery, its biological importance, its physical and atomic properties, how abundant it is on the...

Information about the element, Manganese, atomic number 25. Covers physical properties, atomic properties, how abundant it is on the Earth, details about health-related regulations, and its importance to human health. Also discusses...

Information about the element, Lutetium, atomic number 71. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations.

Information about the metallic element, Lithium, atomic number 3. Covers its discovery, its physical and atomic properties, how abundant it is on the Earth, sources, uses, potential substitutes, and permissible exposure limits.

Information about the element, Krypton, atomic number 36. Covers physical and atomic properties, how abundant it is on the Earth, how it was discovered, uses, and health effects from exposure.

Information about the element, Iron, atomic number 26. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations, and its importance to plant and to animal health. Also...

Information about the element, Iodine, atomic number 53. Covers physical and atomic properties, how abundant it is on the Earth, permissible exposure limits, sources, uses, and potential substitutes.

Information about the first element on the periodic table, Hydrogen, atomic number 1. Covers its history, sources, physical and atomic properties, places it occurs naturally on the Earth and in space, its many uses, and forms in which it...

Information about the element, Helium, atomic number 2. Covers its discovery, physical and atomic properties, how abundant it is on the Earth, its uses, possible substitutes, and permissible exposure limits.

Information about the element, Gold, atomic number 79. Covers its unique physical properties, its atomic properties, how abundant it is on the Earth, sources, uses, and potential substitutes.

Information about the metallic element, Gallium, atomic number 31. Covers its discovery, its physical and atomic properties, sources, uses, how abundant it is on the Earth, and permissible exposure limits.