Periodic Table

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periodic table

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an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group

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period

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a row of chemical elements in order by atomic number

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group

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a column of elements, they are often very similar in how they look and act

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element

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a pure substance made up of only one type of atom

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atomic number

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the number of protons in the nucleus of an atom

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metal

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an element that conducts heat and electricity well and requires high temperatures to melt

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metalloid

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an element that has a mixture of properties in between metals and nonmetals

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nonmetal

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an element that does not conduct heat or electricity well and melts at lower temperatures

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atom

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the smallest component of an element; consists of protons, neutrons, and electrons

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proton

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a subatomic particle with a positive charge; found in the nucleus of an atom