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Unit 3
| Term | Definition |
|---|---|
| Atom | The smallest particle into which an element can be divided and still and still be the same element |
| electrons | particles within the atom that have a negative charge |
| nucleus | a small dense center of an atom that has a positive charge and is surrounded by moving electrons |
| protons | positive charged particles in the nucleus |
| neutrons | uncharged particles in the nucleus of an atom |
| electron cloud | a region around the nucleus of an atom where electrons are likely to be found |
| atomic number | the number of protons in the nucleus of an atom |
| mass number | the total number of protons and neutrons in an atoms nucleus |
| Periodic table | Periodic table An arrangement of elements on a table created by Dmitri Mendeleev |
| Chemical symbol | An abbreviation of an elements name |
| Average atomic mass | The weighted average of the masses of all the naturally occurring isotopes of that element |
| group | Each vertical column of elements on the periodic table |
| metal | Elements that are shinny and conduct heat and electricity well |
| period | Each horizontal row of elements on the periodic table |
| nonmetal | Elements that are poor conductors of heat and electricity |
| meataloid | Elements that have some properties of metals and nonmetals |
| Chemical bonds | an interaction that holds atoms or ions together |
| Valence Electron | Electrons on the outermost energy level of an atom |
| Ion | a particle with a negative or positive charge |
| Molecule | A group of atoms held together by chemical bonds |
| Ionic Bond | A force that brings oppositely charged ions together |
| Corvalent Bond | Forms when atoms share one or more pairs of electrons |
| Metallic Bond | Forms between metal atoms when their outermost energy levels overlap |