Answer
(a) element name is platinum so $X=Pt$. Number of neutron $N=117$
(b) element name is Sulphur so $X=S$. Number of neutron $N=16$
(c) element name is Copper so $X=Cu$. Number of neutron $N=34$
(d)element name is Boron so $X=B$. Number of neutron $N=6$
(e)element name is Plutonium so $X=Pu$. Number of neutron $N=145$
Work Step by Step
(a) $ ^{195}_{78}X$
Comparing with $ ^{A}_{Z}X$
we get
$A=195$
$Z=78$
element name is Platinum so $X=Pt$
number of neutrons $N=A-Z$
$N=195-78=117$
no of neutron $N=117$
(b) $ ^{32}_{16}X$
Comparing with $ ^{A}_{Z}X$
we get
$A=32$
$Z=16$
element name is Sulphur so $X=S$
number of neutrons $N=A-Z$
$N=32-16=16$
no of neutron $N=16$
(c) $ ^{63}_{29}X$
Comparing with $ ^{A}_{Z}X$
we get
$A=63$
$Z=29$
element name is Copper so $X=Cu$
number of neutrons $N=A-Z$
$N=63-29=6$
no of neutron $N=34$
(d) $ ^{11}_{5}X$
Comparing with $ ^{A}_{Z}X$
we get
$A=11$
$Z=5$
element name is Boron so $X=B$
number of neutrons $N=A-Z$
$N=11-5=6$
no of neutron $N=6$
(e) $ ^{239}_{94}X$
Comparing with $ ^{A}_{Z}X$
we get
$A=239$
$Z=94$
element name is Plutonium so $X=Pu$
number of neutrons $N=A-Z$
$N=239-94=145$
no of neutron $N=145$
