Answer
a) $_{28}^{59}Ni$
b) $_{94}^{244}Pu$
c) $_{74}^{184}W$
Work Step by Step
Atomic numbers are taken from the periodic table.
a) Ni: Z=28, n=31: A=Z+n=59
$_{28}^{59}Ni$
b) Pu: Z=94, n=150: A=Z+n=244
$_{94}^{244}Pu$
c) W: Z=74, n=110: A=Z+n=184
$_{74}^{184}W$
