Stack #102242
Help!
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| Mendeleev | first developer of the periodic table
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| how elements are arranged on the table | by atomic number
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| number of groups on the table | 18
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| number of periods on the periodic table | 7
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| alkali metals | group 1 most reactive
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| alkaline earth metals | group 2
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| Halogens | group 17
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| noble gases | group 18/ non reactive
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| metalloids | upper right corner of pt
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| negatively charged particle | electron
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| proton | positively charged particle in the nucleus
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| neutron | neutrally charged particle in the nucleus
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| atomic number | number of protons in atom
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| atmoic weight | mass number
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| isotope | atoms of the same element with same number protons different number neutrons
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| transition metals | groups 3-12
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| inner trainsition metals | bottom rows on periodic table
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| groups/families | vertical columns on the periodic table
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| periods | horizontal rows on periodic table
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Created by:
haylcarp