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chapter 4 elements
elements and chemical bond
Question | Answer |
---|---|
chemical bond | a force that holds two or more atoms together |
valence electron | the outermost electron of an atom thaat participates in chemical bonding |
electron dot diagram | a model that represents valence electrons in an atom as dots around the elements chemical symbol |
covalent bond | a chemical bond formed when two atoms share one or more pairs of valence electrons |
molecule | a group of atoms held together by covalent bonding that acts as an independent unit. |
polar molecule | a molecule that has a partial positive end and a partial negative end because of unequal sharing of electrons |
chemical formula | a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound |
ion | A atom that is no longer electrically neutral because it is lost or gained valence electrons |
metallic bond | a bond formed when many metal atoms share their pooled valence electrons |
ionic bond | the attraction between positively and negatively charged ions in an ionic compound |