Physics, 06.07.2019 01:00, zakwolthuis

Iguess we're not allowed to post more then one so here is one of them for my if you answer them all it'll be like 100 for the following questions, use a periodic table and your atomic calculations to find the unknown information about each isotope: you have a helium isotope with 2 neutrons. what is the mass number? 2 4 4.0026 6

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