Term | Definition |
Atomic Mass | Average mass of one atom of an elements |
Periodic Table | A Chart where all elements are organized into periods and group according to thier to thier properties |
Chemical Symbol | One or two letter code that stands for an element; many sumbols are abbrievation of the elements name, which may be latin, english, or greek in origin |
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; also called chemical family |
Matter | The material that all objects and substances are made of; anything that has a mass and takes up space |
Element | Substances that are the building block or all matter; an element is made up of one kind of atom |
Compound | Matter made of two or elements; the elements in a compound are chemically bonded, cannot be seperated by physical means, and a compound has properties that are different from the elements that make it up |
Atom | Smallest particle into which an element can be divided and still have the properties of that element |
Electron | Negatively charged particle found outside the nucleas of a proton |
Nucleas | Center of an atom made up of protons and neutrons |
Proton | Positively charged particle in the nucleas of an atom |
Neutron | In a atom, particle with a neutral charge; located in the nucleas |
Energy Level | The amount of energyh carried by an electron in an atom; determines the electron's average distance from nucleas |
Isotype | Atoms of the same element with different numbers of neutrons in hte nucleas, and thus different atomic masses for example, carbon-12 |
Mass Number | The sum of protons and neutrons in the nucleas of an atom |
Atomic Number | The number of protons in the nucleas in the nucleas of a atom |
Metal | A class of elements characterized by physical properties: shiniess, malleability, ductility, conductivity |
Malleble | A term used to describe material that can be pounded into shapes |
Ductile | Term to describe a material that can be strecthed into a long object |
Conductivity | The ability of a n object to transfer heat to another object |
Reactivity | The ease or speed with an element comines or reacts, with other elements or compound |
Corrosino | The gradual wearing away of metal element element due to chemical reaction |
Alkai 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 element in group 3 through 12 of the periodic table |
Alloy | A mixture of two or more elements, one of which is a metal |
Non-Metal | An element that lacks most of the properties of a metal |
Diatomic Molecule | A molecule consiting of two atoms |
Halogen | An element foung in group 17 of the periodic table |
Metaloid | An element that has some characteristics of both metal and non-metals. |
Noble Gas | An element foung in group 18 of the periodic table |
Semi-Conductor | A substance that can conduct electricity under some conditions |