GENERAL KNOWLEDGE

Detailed explanation-1: -Given data The 22688Ra 88 226 R a nucleus emits an alpha particle. In alpha particle emission, the atomic number of the parent atom decreases by two and mass number decreases by four. Therefore the resulting nucleus will be that of Radon atom.

Detailed explanation-2: -The nucleus of an atom of radium-226 contains 226 nucleons (neutrons and protons). The nucleus of an atom of radon-222 contains 222 nucleons (neutrons and protons). We also know that the atomic number (Z) of radium-226 from the periodic table is 88 which means that an atom of radium-226 has 88 protons in its nucleus.

Detailed explanation-3: -Radium-226 decays by alpha particle radiation to an inert gas, radon-222, which also decays by alpha particle radiation. Due to the short half-life of radon-222, 3.8 days, there is a high probability it will decay in the body when breathed in, emitting alpha particle radiation in the body.