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A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

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Elements of the periodic Group 0; also called rare gases; formerly called inert gases, He,Ne,Ar, Kr, Xe, Rn.

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Group VIIA elements: F, Cl, Br, I

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"an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell".

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The smallest particle of an element

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the measure of an atom's ion in a crystal lattice.

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Radius of an atom.

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The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.

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Elements 90 to 103 (after actinium)

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Elements 58 to 71 (after lanthanum)

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Group IIA metals

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Metals of Group IA (Na, K, Rb).

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Outermost electrons of atoms; usually those involved in bonding.

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An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.

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Integral number of protons in the nucleus; defines the identity of element.

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One twelfth of a mass of an atom of the carbon-12 isotope; a unit used for stating atomic and formula weights; also called dalton.

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A subatomic particle having a mass of 1.0073 amu and a charge of +1, found in thew nuclei of atoms.

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A subatomic particle having a mass of 0.00054858 amu and a charge of 1-.

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A neutral subatomic particle having a mass of 1.0087 amu.

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The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.