Physics, 23.11.2021 18:50 cierramcdonald
This is a halogen and is found in group (15). It has (16) valence electrons. It has 17 electrons in a neutral atom. The element is (17), symbol (18). It has (19) photons and a mass number of 35. How many neutrons does it have? (20)
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This is a halogen and is found in group (15). It has (16) valence electrons. It has 17 electrons in...
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