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18 Cards in this Set
- Front
- Back
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nucleus |
the centrial core of an atom containing protons and usually nutrons |
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proton |
a small, possitivly charged particle in the nucleus of an atom |
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neutron |
a small particle in the nucleus of an atom, with no electrical charge |
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electron |
a tiny, negitivly charged particle that moves around the nucleus of an atom |
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atomic number |
the number of protons in the nucleas of an atom |
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isotope |
an atom with the same number of protons and different number of nutrons from other atoms of the same element |
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mass number |
the sum of protons and nutrons in the nucleas of an atom |
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model |
in science, a diagram, a mental picture, a mathmatical statement, or an object that helps explaigh ideas about the natural world |
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atomic mass |
the average mass of all the isotopes of an element |
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periodic table |
a chart of the elements showing a repeating pettern of their properties |
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chemical symbol |
a one- or two- letter representation of an element |
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period |
a horizontal row of elements in a periodic table |
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group |
elements in the same verticle colomn of the periodotic tabl; also called family |
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metal |
a class of elements charecterized by physical properties that include shineyness, malleability, ductility, and conductivity |
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malleable |
a term used to describe materials that can be pounded into shapes |
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ductile |
a term used to describe a material that can be pulled out into a wire |
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conductivity |
the ability of an object to transfur heat or electricity to another object |
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reactivity |
the ease and speed with which an element combines, or reacts with other elements and compounds |
