Which of the following best describes the nature of an -particle emitted during radioactive decay? — Nuclear Chemistry and Radioactivity Chemistry Question

💡 Solution & Explanation

An $\alpha$ -particle consists of 2 protons and 2 neutrons. It is physically identical to a doubly ionized helium atom (a helium nucleus, ${}_{2}^{4}He^{2+}$) with a $+2$ charge and a mass of $4$ units.