Gold is the 79th element on the periodic table and has a relative atomic mass of 196.967. Gold, which has a chemical symbol of Au, is a shiny, valuable metal that was first discovered more than 5,500 years ago. More »

Gold is a chemical element. Its symbol on the periodic table is Au, and it is classified as a transition metal. It has an atomic number of 79, which is one of the higher atomic numbers of elements that occur naturally. More »

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The atomic number is the number of protons in the nucleus of an atom, according to M.J. Farabee, author of Chemistry 1: Atoms and Molecules. The number of protons define the identity of an element, and it determines how ... More »

Sodium is a metallic element on the periodic table with an atomic number of 11 and an atomic mass of 22.98 amu. This atomic mass is calculated by adding together the number of protons and neutrons present in the atom's n... More »

Hydrogen has one valence electron because it is an element found in group 1 of the periodic table. It is a simple task to find the number of valence electrons from the periodic table by looking at the group number found ... More »

Oxygen is an element that is found in period two and group 16 on the periodic table of elements. It has an atomic number of 8 and a rounded atomic weight of 16, meaning that the element has eight protons, eight electrons... More »

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The Roman numerals on a periodic table of elements define the chemical group of the elements in that column and identify the number of valence electrons of each element. Group IA elements have one valence electron; group... More »