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Unit 3, Lesson 1-2
| Term | Definition |
|---|---|
| atom | the smallest particle into which an element can be divided and still be the same element |
| electron | negatively charged particles |
| nucleus | a small, dense center that has a positive charge and is surrounded by moving electrons |
| proton | positively charged particles |
| neutron | particles with no electric charge |
| electron cloud | the region around the nucleus of an atom where electrons are likely to be found |
| atomic number | the number of protons in the nucleus |
| mass number | the total number of protons and neutrons in an atom's nucleus |
| periodic table | arrangement of the elements |
| chemical symbol | abbreviation of the chemical's name |
| metals | elements that are shiny and conduct heat and electricity well |
| nonmetals | poor conductors of heat and electricity |
| metalloids | elements that have some properties of metals and some properties of nonmetals |
| group | each vertical column of elements on the periodic table |
| period | horizontal row of elements |