what did he do with elements with similar chemical properties
he put them in columns
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how did mendeleev predict elements
Mendeleev arranged the elements in order of increasing atomic mass, the properties where repeated so He corrected the known atomic masses of some elements and he used the patterns in his table to predict the properties of the elements he thought must exis
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what is the atomic number
the atomic number is the amount of rotons and electrons in an atom
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what are the catergories in the periodic table
reactive metals, post-transitional metals, transitional metals, non-metals and noble gases
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how many electrons are allowed into the first shell
2
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how many electrons are allowed into the second third and fourth shell
8
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what are group 1 metals called
alkali metals
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why are group one metals very reactive
because all of them ae ready to lose a single electron on the outer shell
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what happens if you put a group 1 metal in water
a vigorous reaction
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what are group 7 elements called
halogens
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Other cards in this set
Card 2
Front
how are elements sorted
Back
into groups based on their properties
Card 3
Front
what did he do with elements with similar chemical properties
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