A particle that contains 8 protons, 9 neutrons and 7 electrons could be written as ____________
A. \({ }_{8}^{16} O\) B. \({ }_{8}^{17} O ^{-}\) C. \({ }_{9}^{17} O ^{-}\) D. \({ }_{8}^{17} O\)
Correct Answer: D
Explanation
Mass no \(=\) proton no \(+\) neutron no \(=8+9=17\)tomic no \(=\) proton no \(=8\) If it is neutral, thenlectron no \(=\) proton no \(=8\) Since the electron no is 7 , it means it is deficient in electron by 1 (that is, it has a charge of \(+1\) ). Hence it is \({ }_{8}^{17} O ^{+}\)
