Chemistry, 26.07.2019 16:00 grenades5027
The elements in a star can be determined by analyzing the star's spectrum. which statement explains why no two elements have the same spectrum? a. each element has a unique arrangement of electrons. b. no element has more than two electrons in the first shell. c. atoms of different elements have different masses. d. atomic nuclei contain no electrons.
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The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.
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The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false
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