TMS Science Chapter 7 Elements and the Periodic Table
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Created by:
Johnfcfox5 on January 25, 2012
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17 terms
Terms | Definitions |
|---|---|
 Physical properties | the characteristics of a substance that can be observed or measured without changing the substance |
| Chemical properties | characteristic that cannot be observed without altering the substance |
| periodic table | A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together. |
| metal | any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
| nonmetals | elements that are poor conductors of heat and electric current |
| mass unit (amu) | a unit of measurement for mass |
| atomic mass | total mass of the protons and neutrons in an atom, measured in atomic mass units |
| alkali metals | Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium |
| halogens | group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts |
| noble gases | one of the elements of group 18 of the periodic table(helium, neon,argon, krypton, xenon, and radon); noble gases are unreactive |
| periodicity | the repeating pattern of chemical and physical properties of the elements. Melting and boiling points. |
| electrical conductors | material that allow electric charges to move easily |
| thermal conductors | substances that conduct thermal energy very well |
| insulators | materials that prevent electric charges from flowing through them easily |
| Why are elements arranged in the periodic table? | It has to do with the way the orbitals (electron shells) are arranged on atoms. |
| What sort of information can the periodic table of elements give you? | The number of protons, electrons, and neutrons of each element. It can also give you information about groups or families (highly reactive, metals or nonmetals, etc.) |
| Why does the periodic table have the shape that it does? | Because Mrs. Delaney, Mrs. Schneider, and Mr. Doolittle designed it. |
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