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An atom with atomic number 9 and mass number 19 will have the following constituents:A. 9p, 9n, 9eB. 9p, 10n, 9eC. 10p, 9n, 9eD. 9p, 9n, 10e |
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Answer» We know that, Atomic number = Number of protons = 9. Hence, 9p Mass number = Number of protons + Number of neutrons ⇒ 19 = 9 + Number of neutrons ⇒ Number of neutrons = 19-9 =10 Hence, 10n Now, Number of electrons = Number of protons ⇒ Number of electrons =9 Hence, 9e Therefore, the correct option is B |
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