The mass number of an atom is 15 and its atomic number is 7 . Now, this atom absorbs an \alpha -particle and emits a proton. What will be the mass number of changed atom?

Manipal Entrance Test 2020 Physics Paper

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The mass number of an atom is 15 and its atomic number is 7 . Now, this atom absorbs an α -particle and emits a proton. What will be the mass number of changed atom?

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