S103

Which element results if 2 protons and 2 neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226 - show workings?

What is actually ejected is an alpha particle (helium nucleus). The new atomic number is 88-2 = 86 and the new atomic weight is 226 - 4 = 222. Use a periodic table or elements list to identify the remaining nucleus.
Hint: it is a gas

thank you - very much appreciated.

RN Radon 222 / 86

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