most reactive family of elements - Alkali metals, family of inert elements - Noble gases, vertical columns on the periodic table - groups, horizontal rows on the periodic table - periods, how we classify the majority of elements - metals, Elements found as gas at room temperature - nonmetals, elements found along the staircase - metalloids, The reason Lithium (Li), Sodium (Na), and Potassium (K) are in the same family on the periodic table - they share the same chemical properties, valence electrons - electrons in the outermost electron shell of the atom, the positive part of the atom - proton, the negative part of the atom - electron, what holds the protons inside the nucleus of the atom - neutron,

Using the periodic table

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