A reaction is monitored and the products are found to be a salt and water. The reactant(s) must have been___

Alpha particles have positive charge, beta particles have negative charge, and answer 4 just doesn’t make sense. thus, you are left with only one possible answer.

The closer the atoms are to becoming ionic the more highly dense the negatively charged side gets.

It would be true sodium reacts with water in a violent way 

Go ask spider man