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What is an atom?
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An atom is the smallest unit of an element that maintains the properties of that element, consisting of protons, neutrons, and electrons.
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What is the periodic table?
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The periodic table is a tabular arrangement of chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties.
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Who created the modern periodic table?
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Dmitri Mendeleev is credited with creating the first periodic table similar to the one in use today.
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What is an element?
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An element is a substance that cannot be broken down into simpler substances by chemical means.
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Define atomic number.
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The atomic number is the number of protons in an atom's nucleus and determines the element's identity.
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What determines the chemical properties of an atom?
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The number of electrons, particularly those in the outermost shell, determines an atom's chemical properties.
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What is an ion?
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An ion is an atom that has gained or lost one or more electrons, giving it a positive or negative charge.
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What are isotopes?
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Isotopes are variants of a particular chemical element that have the same number of protons but a different number of neutrons.
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Describe the layout of the periodic table.
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The periodic table is organized into rows (periods) and columns (groups), with elements ordered by increasing atomic number.
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What is a group in the periodic table?
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A group is a vertical column in the periodic table and elements in a group typically have similar chemical properties.
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What is the significance of Group 1 elements?
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Group 1 elements are known as alkali metals; they are highly reactive, especially with water.
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What is an electron shell?
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An electron shell is the outside part of an atom around the atomic nucleus where electrons are found.
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Define valence electrons.
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Valence electrons are the electrons in the outer shell of an atom that are involved in forming bonds.
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What is a period in the periodic table?
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A period is a horizontal row in the periodic table and it indicates the number of electron shells in the atoms of the elements present.
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Why do noble gases have stable electron configurations?
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Noble gases have stable electron configurations because their outer electron shells are full.
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