118 - There are this many elements on the table., 18 - There are this many groups on the table., 7 - There are this many periods on the table., valence electrons - electrons in the outer shell of an atom, groups - vertical columns of elements with similar properties, atomic mass - combined mass of all protons and neutrons of an element's atom, atomic number - number of protons in the nucleus of an atom, metals - elements that are shiny, good conductors, and bendable, non-metals - elements that are dull, poor conductors, and brittle, metalloids - elements on the zigzag line that have properties of both metals and non-metals,

Periodic Table Basics

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