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Atoms,Periodic Table
| Question | Answer |
|---|---|
| what does the atomic number equal | number of protons |
| who organized the first periodic table | Mendeleev |
| who arranged the periodic table in 1913 | Henry Moseley |
| what elements have a lot in common | same periods |
| how many periods are there, how many groups/families | 7, 18 |
| what is the 1st group called | alkali metals |
| what is the 2nd family called | alkaline earth metals |
| what is the 17th group called | halogens |
| what is the 18th family called | noble gases |
| what are noble gases | gases that do not react well with other elements |
| Name 3 characteristics of metals such as cobalt | shiny, solids at room temperature, good heat/electricity conductors |
| Name 3 characteristics of nonmetals such as oxygen | usually gases at room temperature, brittle solids, DO NOT conduct heat/electricity well |
| synthetic element | man-made element, above the atomic number 92 |
| if a metal can be easily hammered into a shape it is called | malleable |
| alkaline earth metals are | highly reactive |
| transition metals are | less reactive |
| what are metalloids | have properties of metals and nonmetals |
| what do we call something in between a conductor and an insulator | a semi-conductor |
| the atomic mass is the number of | protons + neutrons |
| protons are equal to | electrons |
| the number of neutrons is | atomic mass-atomic number |
Created by:
Hattison13
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