The Periodic Table

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What is the Periodic Table?

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A tabular arrangement of chemical elements, organized by increasing atomic number, where elements with similar properties are grouped together.

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What is an element?

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A pure substance that cannot be broken down into simpler substances by chemical means, consisting of atoms with the same number of protons.

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What is the atomic number?

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

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What is atomic mass?

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The weighted average mass of an element's isotopes, measured in atomic mass units (amu).

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What are noble gases?

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A group of inert gases in Group 18 of the periodic table, known for their lack of reactivity due to having a full valence shell.

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What is a metal?

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

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What is a non-metal?

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

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What is a group in the periodic table?

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A vertical column in the periodic table that contains elements with similar chemical properties.

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What is a period in the periodic table?

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A horizontal row in the periodic table, indicating the number of electron shells in the elements.

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Who is Dmitri Mendeleev?

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A Russian chemist who created the first widely recognized periodic table, arranging elements by atomic mass.