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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 09:00
How are isotopes of the same chemical element alike? how are they different?
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Chemistry, 22.06.2019 10:00
Drug abuse will not lead to physical and psychological dependence. true or false ?
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Chemistry, 22.06.2019 13:00
If two objects at different te,peraure are in contact with each other what happens to their temperature
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