Question

# Atom A has a mass number 209 and atomic number 82. Atom B has a mass number 209 and atomic number 83. (i) How many protons atom A has ? (ii) How many protons atom B has ? (iii) Are atoms A and B isotopes of the same element ?

Solution

## Atom A – ${}^{209}\mathrm{A}_{82}$ Atom B – ${}^{209}\mathrm{A}_{83}$ (i) A has 82 protons as the atomic number is 82. (ii) B has 83 protons as the atomic number is 83. (iii) No, A and B are not isotopes of each other because their atomic numbers are not same.ScienceLakhmir Chemistry (2020, 2021)All

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