click below
click below
Normal Size Small Size show me how
Gullett-Chem-Ch3
Chemistry-Ch3-LivingbyChemistry
| Term | Definition |
|---|---|
| atom | the smallest unit of an element that retains all the chemical properties of that element and can exist as a seperate particle |
| atomic theory | a theory that states that all matter is made up of individual particles called atoms |
| model | A simplified representation of a real object or process that facilitates understanding or explination of that object or person |
| nucleus | the dense positively charged structure composed of protons and neutrons that is found in the center of an atom |
| proton | a positively charged particle located in the nucleus of an atom. The mas is about 1 amu |
| neutron | a particle that is located in the nucleus of an atom and does not have an electric charge; the mass is about 1 amu |
| electron | An elementary particle with a negative charge tht is located outside of the nucleus of an atom, has a mass of about 1/1840 amu |
| atomic number | equal to the number of protons in an atom and is used to identify an element on the periodic table |
| atomic mass | measured in atomic mass units (amu) it is the total mass of protons and neutrons in the nucleus of an atom |
| average atomic mass | the average mass of the naturally occuring isotopes of an element |
| isotope | atoms of the same element with differing numbers of neutrons |
| radioactive isotope | isotopes of an element that are less stable and emit subatomic particles spontaineously over time. |
| nuclear reaction | changes in the nucleus of an atom |
| readioactive decay | the process of ejecting or emitting pieces from the nucleus of an atom |
| fission | the splitting apart of a nucleus |
| fussion | the joining of nuclei to form a larger nucleus |