Periodic Table

Front

What is the Periodic Table?

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The Periodic Table is a tabular arrangement of chemical elements, organized by increasing atomic number, electron configuration, and recurring chemical properties.

Front

What are periods in the Periodic Table?

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Periods are the horizontal rows in the Periodic Table. Each period represents a new energy level of electrons.

Front

What are groups in the Periodic Table?

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Groups are the vertical columns in the Periodic Table. Elements in the same group have similar chemical properties and the same number of valence electrons.

Front

What is an atomic number?

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The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means, consisting of only one type of atom.

Front

What is a compound?

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A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

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What are metals?

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Metals are elements that are typically shiny, good conductors of heat and electricity, and malleable and ductile.

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What are nonmetals?

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Nonmetals are elements that are generally poor conductors of heat and electricity and can be gases, liquids, or brittle solids.

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What are metalloids?

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Metalloids are elements that have properties of both metals and nonmetals, often used as semiconductors.

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What is the significance of valence electrons?

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Valence electrons are the outermost electrons of an atom and are important for determining how an element will react chemically.