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What is the Periodic Table?
A chart of the chemical elements organized by atomic number, electron configuration, and recurring chemical properties.
What is Atomic Number?
The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
What are Metalloids?
Elements with properties that are intermediate between those of metals and nonmetals; they are semiconductors of electricity.
What is a Period?
A horizontal row of elements in the periodic table. There are 7 periods.