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An ion that has a positive charge.

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Metals used to make coins

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Indicates the relative ability of an element's atoms to attract electrons in a chemical bond.

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A vertical column of elements in the periodic table arranged in order of increasing atomic number also called a family.

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A highly reactive group 17 elements

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An atom or bonded group of atoms with a positive or negative charge.

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The radius of an atom's ion

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Any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table.

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The main group is the group of elements whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon as arranged in the periodic table of the elements.

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An element that is solid at room temperature, a good conductor or heat and electricity, and is generally shiny most metals are ductile and malleable.

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Metalloid- Element that has physical and chemical properties of both metals and nonmetals. 

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Metalloid- Element that has physical and chemical properties of both metals and nonmetals. 

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An extremely nonreactive group 18 element.

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Elements that are generally gasses, dull, brittle solids that are poor conductors of heat and electricity.

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Horizontal row of elements in the modern periodic table.

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States that when the elements are arranged by increasing atomic number, there is a periodic repetition of their properties.

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The attraction between an electron and the nucleus in any atom with more than one electron shell. Can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces of the electrons on the nucleus.

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Elements in groups 3-12 of the modern periodic table are further divided into transition metals and inner transition metals.