Periodic Table of the Elements

Christopher Johnson and Alex Haskovec

Atomic Mass

Atomic Mass is the about the sum of the number of protons and neutrons in the nucleus.

Atomic Number

Number of protons in the atom, located in the nucleus. The number of protons determines what element it is, it acts as an identity.
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Periodic Groups

Periodic Groups are the individual columns on the periodic table.

Periods

The horizontal rows on the periodic table. This is organized by the atomic number. i.e: 1: hydrogen 2: Helium 3: Lithium, etc.
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Metals

Elements that are characterized by their hardness, conductivity, luster and versatility.

Metalloids

Elements that have semi-metallic properties, yet still share characteristics with non-metals. They are electrical semiconductors.

Non-Metals

Any element that is not a metal.

Stair-Step-Line

The line that divides metals and non-metals on the periodic table. The stair-step-line is made up of Boron, Silicon, Germanium, Arsenic, Antimony, Tellurium, and Polonium(Metalloids).
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