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An atom of beryllium has 4 protons, 4 electrons, and 5 neutrons. What is its mass number?
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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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Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)
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An atom of beryllium has 4 protons, 4 electrons, and 5 neutrons. What is its mass number?...
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History, 30.07.2019 13:10
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English, 30.07.2019 13:20
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