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Chemistry, 22.06.2019 00:00
Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.
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Chemistry, 22.06.2019 12:30
In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)
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Chemistry, 22.06.2019 15:30
The identities of substances are the same before and after which type of change
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Chemistry, 23.06.2019 00:30
In a ball-and-stick molecular model, what do the sticks represent?
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How many grams of KOH do we need to make 250.0ml of a 0.75 M...
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