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There are main groups in the modern periodic table of elements
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Chemistry, 22.06.2019 16:00
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Chemistry, 22.06.2019 19:50
What is the wavelength of a wave with a velocity of 50 m/s and a frequency of 5hz a 250 m b 0.1 m c 10m d 0.01 m
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What is absolute zero equal to in degrees celsius?...
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