identify branch of chemistry: elements radium decays by emitting a-particles and is converted into another radon
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When radium decays, it emits α-particles and turns into radon. Radon is a chemically stable element, like helium and neon. Being chemically stable or being an inert element means that it stably exists as radon without reacting with other elements to form compounds.
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Explanation:
A radium nucleus is a massive nucleus of 226 nucleons, including 88 protons and 138 neutrons. It decays by emitting an alpha particle composed of two protons and two neutrons. The radium nucleus turns into radon-222 nucleus, itself radioactive, containing two protons and two neutrons less.
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