True or False: The reactants and the products of a chemical equation always have the same number of atoms.

True

Explanation: It always has the same number because the both have or are using the same product.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer