The phase change in which a substance changes from a liquid to a solid is a. freezing. b. melting. c. sublimation. d. condensation.

freezing. Think of what happens when you put water in the freezer

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