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The correct statement : The atomic number of the radioactive nuclide is 90.
<h3>Further explanation</h3>In the following element notation,
X = symbol of elemental atom
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
The symbol for a radioactive nuclide :
atomic number = 90
mass number = 234
number of neutrons = 234-90=144
number of protons = atomic number = 90