21acrocker
21acrocker
23-10-2017
Chemistry
contestada
what first 16 elements were known in 1760
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kittensdogsoy94id
kittensdogsoy94id
23-10-2017
suphur
chlorine
argon
neon
carbon
oxygen
helium
silicon
calcium
hydrogen
nitrogen
sodium
florine
lithium
aluminum
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