Unit 5 Vocab PDF

## Quick Vocabulary ### Lesson 1 * **chemical bond** force that holds atoms together * **compound** material that is made up of two or more different kinds of atoms joined by chemical bonds * **electron dot diagram** model that represents valence electrons in an atom as dots around the element's ch...

## Quick Vocabulary ### Lesson 1 * **chemical bond** force that holds atoms together * **compound** material that is made up of two or more different kinds of atoms joined by chemical bonds * **electron dot diagram** model that represents valence electrons in an atom as dots around the element's chemical symbol * **valence electron** outermost electron of an atom and participates in chemical bonding ### Lesson 2 * **bond** force that holds atoms together in a compound * **chemical formula** group of chemical symbols and numbers that represent elements and numbers of atoms of each element that make up a compound * **covalent bond** forms when two atoms share one or more pairs of valence electrons * **molecule** group of atoms held together by covalent bonding * **polar molecule** has a slight positive end and a slight negative end because of unequal sharing of electrons ### Lesson 3 * **ion** atom that is no longer electrically neutral because it has lost or gained valence electrons * **ionic bond** attraction between positively and negatively charged ions * **metallic bond** forms when many metal atoms share their pooled valence electrons