After a severe accident, a person can write and talk but has to learn to walk again. What part of the nervous system was probably affected? Explain
why?

Answer is cerebellum. And this is the right answer

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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yes it is balanced