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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.
Answers: 1
Chemistry, 22.06.2019 00:30
This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.
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Chemistry, 22.06.2019 09:00
If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?
Answers: 1
A pure substance that can be broken down into two or more different pure substances by a chemical ch...
Mathematics, 06.07.2019 12:00
Mathematics, 06.07.2019 12:00
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Mathematics, 06.07.2019 12:00
Mathematics, 06.07.2019 12:00
Mathematics, 06.07.2019 12:00
Mathematics, 06.07.2019 12:00
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Chemistry, 06.07.2019 12:00
History, 06.07.2019 12:00