The main difference in the structures of each state of matter is what? A.
The volume of the particles

B.
The density of the particles

C.
The kinetic energy of the particles

D.
The potential energy of the particles

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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