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Chemistry, 21.06.2019 20:30
Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge
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Chemistry, 22.06.2019 06:00
An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have
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Chemistry, 22.06.2019 11:00
The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?
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When two clear, colourless liquids are mixed together, a yellow precipitate is formed. This is an ex...
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