The document provides information about trends in the periodic table including: - Atomic radius decreases and electro-negativity increases when going left to right or down groups 1 and 7 due to increased shielding and decreased pull from protons. - Metalloids are between metals and non-metals. Metals have properties like conductivity while non-metals want to gain electrons. Noble gases do not react. - The periodic table was created by Dmitri Mendeleev to show patterns in properties based on atomic mass.