Chapter 19 Flashcards
Chemically stable
Describes an atom whose outer energy level is completely filled with all the electrons allowed in that level.
Chemical formula
Chemical shorthand that uses symbols to tell what elements are in a compound and their ratios.
Chemical bond
Force that holds atoms together in a compound
Compound
Substance formed from two or more elements in which the exact combination and proportion of elements in always the same.
Ion
Charged particle that has more or fewer electrons than protons
Ionic bond
Attraction formed between oppositely charged ions in an ionic compound
Covalent bond
Attraction formed between atoms when they share electrons
Molecule
A neutral particle that forms as a result of electron sharing
Polar molecule
Molecule with a slightly positive end and a slightly negative end as a result of electron being shared unequally.
Nonpolar molecule
Molecule that shares electrons equally and does not have oppositely charged ends.
Binary compound
Compound that is composed of two elements
Oxidation number
Positive or negative number that indicates how many electrons an atom has gained, lost, or shared to become stable
Polyatomic ion
Positively or negatively charged, covalently bonded group of atoms
Hydrate
Compound that has water chemically attached to its ions and written into its chemical formula
Subscript
Written below
