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unit 3 matter/energy
unit 3 lesson 1&2
| Term | Definition |
|---|---|
| atom | smallest particle into which an element can be divided and still be the same element |
| electrons | negative charged particles |
| nucleus | small dense center positive charge surronded by moving electrons |
| proton | positively charged |
| neutron | have no electric charge |
| electron cloud | negative particles moving around nucleus |
| atomic number | number of protons in the nucleus of an atom |
| mass number | total number of protons and neutrons in atoms nucleus |
| periodic table | arrangement of elements |
| chemical symbol | abbreviation for an elements name |
| average atomic mass | atom is the weighed average of masses of all the naturally occuring isotopes of that element |
| metals | elements that are shiny and conduct heat and electricity |
| nonmetals | poor conductors of heat and energy |
| metalloids | some properties of metals and nonmetals |
| group | vertical line in the periodic table |
| period | horizontal row of elements on periodic table |
Created by:
18ddunn0914
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