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Science
4.2-4.4/ 2013-14
| Question | Answer |
|---|---|
| Who created the first periodic table? | Mendeleev |
| How did Mendeleev arrange the elements? | In order of increasing atomic mass |
| How was the periodic table re-arranged later? | in order of increasing atomic number |
| Which group has the most elements? | metals |
| Rows are called? | Periods |
| Columns are called? | groups or families |
| What is the sun mostly made of? | Hydrogen |
| Nuclear fusion? | Combining 2 nuclei |
| What are physical characteristics of metals? | shiny, malleable (hammered into a thin sheet), ductile (pulled into a long wire), can conduct electricity, high melting and boiling points |
| Chemical properties of metals? | reactive (can easily combine with another element); corrosive |
| Metals react by ___________ electrons | losing |
| Most reactive metal? | francium |
| How does the reactivity of metals change as you go from left to right on the periodic table? | It decreases |
| What kind of metals are located in group 1? | alkali metals |
| What kind of metals are located in group 2? | alkaline earth metals |
| how do alkaline earth metals react with other elements? | lose 2 electrons |
| What kind of metals are found in groups 3-12? | transition metals |
| Where are metalloids located? | along both sides of the zig zag line |
| Metalloids have properties of both ___________ and _____________________ | metals and non-metals |
| Where are non-metals? | on the right side of the periodic table |
| What is the most useful property of a metalloid? | Its ability to conduct electricity |
| What is the most common metalloid? | silicon |
| What is a semiconductor? | conducts electricity under certain circumstances but not under all circumstances |
| What are the characteristics of non-metals? | the opposite of metals |
| What is the non-metal that is the most reactive element known? | fluorine |
| Which non-metal is a liquid at room temperature? | bromine (Br) |
| Where are halogens located? | group 17 |
| What does halogen mean? | salt forming |
| How do halogens react with other elements? | they gain or share one electron |
| Where are noble gases found? | in group 18 |
| Why are noble gases unreactive? | They have a full outer shell (8 electrons are in that outer shell). |
| Why is hydrogen in group 1 even though it is not a metal? | It has one valence electron. |
Created by:
mtnbrook
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