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Definition
| -ancient; - mostly empty space |
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| origin of atoms goes back to |
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| elements heavier than hydrogen and much of the helium were produced in |
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Definition
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| a material made of only one kind of atom |
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| pure gold is an example of |
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Definition
| an element, as it is made of only gold atoms |
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Term
| the fundamental unit of an element |
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Definition
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| this term is used when referring to macroscopic elements |
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| this term is used when discussing the submicroscopic |
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| what makes up all matter around us |
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Definition
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Term
| how many atoms are there? |
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Definition
| 115 to date; 90 are natural the others are synthesized |
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Term
| any material consisting of only one atom |
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Definition
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Term
| protons are ____ times as massive as an electron |
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Definition
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Term
| in an electrically neutral atom, how many protons are there in contrast to electrons |
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Definition
| there are the same amount |
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Term
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Definition
| electrons from other atoms (have an electrical repulsion that prevents atomic closeness) |
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| number of protons in each element listed in the periodic table |
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Definition
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Term
| are neutrons as massive as protons? |
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Definition
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| both ___ and ___ are nucleons |
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Definition
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| refers to atoms of the same element that contain the same number of protons but different numbers of neutrons in the nucleus |
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Definition
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Term
| isotopes are identified by: |
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Definition
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Term
| mass number refers to the total number of ____ and _____ in the nucleus |
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Definition
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Term
| total number of neutrons in isotope (equation) |
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Definition
| mass number-atomic number |
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Term
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Definition
| total mass of the atoms (protons, neutrons, and electrons) |
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Term
| what is the periodic table a listing of? |
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Definition
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Term
on periodic table:
a. vertical column known as
b. horizontal row known as |
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| where is the largest element located on the periodic table? |
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