AP EAMCET Engineering 21 Apr 2019 Shift 2 Paper

The number of neutron is given as
Nn=a+0.32a=1.32a
We know, the number of element is sum of number of protons and number of neutrons.
Substitute the given value in above expression we get
1.81‌‌=1.32a
a‌‌=78.02≈78
The element which acquires the proton of 78 is platinum.