Which elements do not have a set number of valence electrons?
a. alkali earth metals
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What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.
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What type of organic molecule comprises the majority of a potato?
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How many neutrons does an element have if its atomic number is 50 and its mass number is 166
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English, 02.12.2020 16:40
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