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प्रश्न
In the nucleus of `""_20"Ca"^40`, there are ______
पर्याय
20 protons and 40 neutrons
20 protons and 20 neutrons
20 protons and 40 electrons
40 protons and 20 electrons
MCQ
रिकाम्या जागा भरा
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उत्तर
In the nucleus of `""_20"Ca"^40`, there are 20 protons and 20 neutrons.
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