state mendeleffs periodic law
define electronegirivity
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Mendeleev's periodic law states that the properties of the elements are a periodic function of their atomic masses.
Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical element to attract shared electrons (or electron density) when forming a chemical bond. ... The loosely defined term electropositivity is the opposite of electronegativity: it characterizes an element's tendency to donate valence electrons.
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