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Chapter 18
Physical Science 9th grade
| Question | Answer |
|---|---|
| Elements combine chemically to form these when the conditions are right. | Compounds |
| This shows what elements a compound contains and the exact number of the atoms of each element in a unit of that compound. | Chemical formula |
| Every element has one of these. It is usually one or two letters. | Chemical symbol |
| Means written below | Subscript |
| Uses the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level. | Lewis Dot Structure |
| The force that holds atoms together in a compound. | Chemical bond |
| A charged particle that has either more or fewer electrons than protons. | Ion |
| Means written above | Superscript |
| When an atom loses electrons, it becomes a positively charged ion knows as this. | Cation |
| When an atom gains electrons, it becomes a negatively charged ion known as this. | Anion |
| The force of attraction between the opposite charges of the ions in an ionic compound. | Ionic bond |
| The attraction that forms between atoms when they share electrons. | Covalent bond |
| The neutral particle that forms as a result of electron sharing. | Molecule |
| This forms between nonmetallic elements and is composed of two shared electrons. | Covalent bond |
| A covalent bond in which electrons are shared equally by both atoms. | Nonpolar bond |
| Usually formed between metals and non metals. | Ionic bond |
| These are unusually stable and seldom form compounds. | Noble gases |
| Means "having opposite ends". | Polar |
| Bond in which electrons are shared unequally resulting in a slightly positive end and a slightly negative end. | Polar bond |
| One in which the unequal sharing of electrons results in a slightly positive end and a slightly negative end, although the overall molecule is neutral. | Polar molecule |
| A molecule that does not have oppositely charged ends. | Nonpolar molecule |
| A positive or negative number that indicates how many electrons an atom has gained, lost, or shared to become stable. | Oxidation number |
| Compounds of two elements. | Binary compound |
| "having many atoms" | polyatomic |
| A positively or negatively charged, covalently bonded group of atoms. | polyatomic ion |
| A compound that has water chemically attached to its atoms and written into its chemical formula. | Hydrate |
Created by:
Pechacek