Which particles can be stopped by human skin?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Which statement correctly describes potassium iodide, ki? there is a one-to-one ratio of potassium ions to iodide ions. potassium gains electrons and iodine loses electrons during the reaction. the lattice is held together by potassium anions and iodide cations.

In which situation can a mixture always be called a solution