# of neutrons # of electrons
Mass #
# of protons
Atomic #
Symbol
Р
15
28
AL"
38
38
80
119
50
159 Sn
84
84
210
8
7
10

your parents i think this could be it

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

there are two significant figures.