Answer
(a) $neutron=142, protons=90$
(b) $neutron=129, protons=82$
(c) $neutron=33, protons=27$
Work Step by Step
(a) We can find the number of neutrons and protons in $Th^{232}_{90}$ as follows:
$neutrons=Atomic\space mass-Atomic\space number =232-90=142$
and $protons=Atomic\space number=90$
(b) We can find the number of neutrons and protons in $Pb^{211}_{82}$ as follows:
$neutrons=Atomic\space mass-Atomic\space number =211-82=129$
and $protons=Atomic\space number=82$
(c) We can find the number of neutrons and protons in $CO^{60}_{27}$ as follows:
$neutrons=Atomic\space mass-Atomic\space number =60-27=33$
and $protons=Atomic\space number=27$
