The atomic number of element having pseudo inert gas configuration in it’s atomic state is

An element with pseudo noble gas configuration has 18 electrons in the outermost shell instead of 8.
Therefore, element having filled d orbital in ground state will have this pseudo inert gas configuration.
For element with atomic number 46, the configuration is [Kr]4d¹⁰, standing for a filled d orbital.
Hence, option (A) 46, is the correct answer.