Chapter 17 vocab
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Created by:
ssatprep101 on January 19, 2012
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18 terms
Terms | Definitions |
|---|---|
 atomic mass | measure of the average mass of the atomic mass unit |
| atomic nucleus | the core of an atom consisting of two basic subatomic particles, protons and nuetrons |
| atomic symbol | an abbreviation for an element derived from the first one or two letters of the element's name |
| atomic number | the number that desginates the identity of an element which is the number of protons in the nucleus of the atom |
| electron | the negatively charges particles in an atom |
| element | a material made up of any one atom |
| group | a vertical column in the periodic table |
| isotope | atoms whose nuclei have the same number of protons but different numbers of nuetrons |
| mass number | total number of protons and nuetrons isotopes contain |
| metal | an element that is generally shiny, opaque, malleable, ductile, and a good conductor of electricity and heat |
| metalloid | one of the six elements boron, silicon, germanium, arsenic, antimony, tellunum- they exhibet both metalic and non metalic |
| neutron | the electrically nuetral particles in an atomic nucleus |
| non metal | an element that is non malleable, nonductile, and a poor conductor of electricity and heat |
| nucleon | a nuclear proton or neutron; the collective name for either or both |
| period | a horizontal row in the periodic table |
| periodic table | a highly organized chart listing all the known elements arranged in horizontal rows called periods and vertical columns called groups |
| periodic trend | the gradual change of properties of elements across any period |
| proton | the positivly charged particles in an atomic nucleus |
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