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unit 3 book 3
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Question | Answer |
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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 and is surrounded by moving electrons. |
proton | the positively charged particles in the nucleus. |
neutron | uncharged particles in the nucleus. |
electron cloud | 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 |
periodic table | Mendeleev's arrangement of the elements |
chemical symbol | an abbreviation for the element's name |
average atomic mass | the weighted average of the masses of all the naturally occurring isotopes of that element |
metals | elements that are shiny and conduct heat and electricity |
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 | each horizontal row of elements on the periodic table |
chemical bond | an interaction that holds atoms r ions together |
valence electrons |