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Unit 4 vocabulary
| Term | Definition |
|---|---|
| Atomic Mass | Average mass of one atom of an element |
| Periodic Table | A chart where all elements are organized into periods and groups according to their properties |
| Chemical symbol | One-or-two letter code that stands for an element |
| Period | A row of elements in the periodic table arranged by atomic number |
| Group | Column of elements in the periodic table, in which elements have certain properties in common |
| Matter | The material that all objects and substances are made of |
| Element | Substances that are the building blocks of all matter |
| Compound | Matter made of two or more elements and cannot be seperated by physical means |
| Atom | Smallest partcile in which an element can be divided and still have the properties of that element |
| Electron | Negatively charged particle found outside the nucleus of an atom |
| Nucleus | Structure near the center of a cell that contains the cell's DNA |
| Proton | Positively charged particle located in the nucleus of an atom |
| Neutron | In an atom, particle with a neutral charge; located in the nucleus |
| Energy Level | The amount of energy carried by an electron in an atom |
| Isotope | Atoms of the same element with different numbers of neutrons in the nucleus, and thus different atomic masses |
| Mass number | The sum of protons and neutrons in the nucleus of an atom |
| Atomic number | Numbers of protons in the nucleus of one atom of an element |
| Metal | Elements, usually solid, with a shiny surface |
| Malleable | A term used to describe material that can be pounded into shapes |
| Ductile | A term used to describe a material that can be pulled out into a longwire |
| Conductivity | The ability of an object to transfer heat or electricity to another object |
| Reactivity | The ease and speed with which an element combines, or reacts, with other elements and compunds |
| Corrosion | The gradual wearing away of a metal element due to a chemical reaction |
| Alkali Metal | An element in group 1 of the periodic table |
| Alkaline Earth Metal | An element in group 2 of the periodic table |
| Transition Metal | One of the elements in group 3 through 12 of the periodic table |
| Alloy | A mixture of two or more elements, one of which is a metal |
| Nonmetal | An element that lacks most of the properties of a metal |
| Diatomic Metal | A molecule consisting of two atoms |
| Halogen | Group of elements in the periodic table that are highly reactive nonmetals |
| Noble Gas | Group of elements in the periodic table that generally does not react with other elements |
| Metalloid | An element that has some characteristics of both metals and nonmetals |
| Semiconductor | A substance that can conduct electricity under some conditions |
Created by:
abrunelle
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