The amount of a reagent present in a reaction that does not get used up is called the
a. excess reagent
c. limiting reagent
b. excess product
d. limiting product

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.

Rethink and reinvent

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

They make up examples of physical properties