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Unit 3 Ls 1 + 2
Vocabulary
Term | Definition |
---|---|
atom | is 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 in the nucleus. |
neutron | uncharged particles. |
electron cloud | electrons move within an area around the nucleus. |
atomic number | the number of protons in the nucleus of an atom. |
mass number | the total number of protons and neutrons in an atoms nucleus. |
periodic table | Mandeleevs arrangement of the elements. |
chemical symbol | is an abbriviation for the elements name. |
average atomic mass | of an atom weighted average of the masses of all the naturally occuring isotopes of that element. |
metal | are elements that are shiny and conduct heat and electricity. |
nonmetal | are poor conductors of heat and electricity. |
metalloid | are elements that have some properties of metals and some properties of nonmetals. |
group | vertical column of elements on the periodic table. |
period | each horizontial row of elements on the periodic table. |