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Definition
| Something that occurs at regular intervals |
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| This is how Mendeleev grouped the elements in 1869 |
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Definition
| by increasing atomic mass |
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Definition
| British scientist who organized the periodic table by increasing the atomic number |
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Definition
| elements to the right of the zigzag line on the periodic table |
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Definition
| solid at room temperature |
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| 80% of the elements in the periodic table are |
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Definition
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| Property of alkali metals (Group #1) |
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Definition
| They are soft solids that are very reactive |
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Term
| Alkaline-earth metals (Group #2) |
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Definition
Metals that have two outer-level electrons
ex: magnesium, calcium and beryllium |
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| Alkali metals and Alkaline-earth metals |
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Definition
| are the two groups with the most highly reactive metals |
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| Elements on the periodic table are arranged in order of |
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Definition
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| Number of outer level electrons the Oxygen family has |
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Definition
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| Elements that make up the compound baking soda |
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Definition
| Sodium, Hydrogen, Carbon, Oxygen |
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Definition
| 16 protons, 16 electrons, and 18 neutrons |
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| Name of the element with a chemical symbol of K |
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Definition
| `Potassium - has 19 protons |
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Definition
| The horizontal rows on the periodic table - there are 7 periods |
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Definition
| There are 18 groups on the periodic table - the elements in each vertical column that have similar properties |
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| This element is a metalloid |
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Definition
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Definition
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| Group on the periodic table that Lanthanide and Actinides belong to |
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Definition
| Transition metals and it is found below the other elements on the table |
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Term
| Boron is in what group number |
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Definition
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Term
| How many metalloids are in the Boron family |
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Definition
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| This is the order the regions are arranged on the periodic table if you are reading left to right |
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Definition
| metals, metalloids, nonmetals, noble gases |
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Term
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Definition
Metals in groups 3-12
Have 1 or 2 valence electrons
Hard, shiny, ductile
Ex: Gold |
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Definition
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| Lithium, sodium, and potassium all have similar chemical properties because |
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Definition
they are in the same family
They are alkali metals
Each has 1 valence electron |
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Term
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Definition
has one valence electron but shares no other characteristics of group one elements
A nonmetal - on the metal side of the periodic table - that only has one outer level electron |
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Term
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Definition
Reactive non metal
7 Valence electrons
EX: Chlorine |
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Term
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Definition
| Do not easily react with other elements because their outermost (valence) electron shell is full |
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Definition
8 valence electrons
Unreactive
Ex: Neon |
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Term
| From an elements placement in the periodic table |
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Definition
| you can predict its properties |
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