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Neodymium (Nd) has atomic number 60. It is a lanthanide element. The noble gas core is Xenon (Xe, Z=54). After Xe, the electron filling order is: 6s, then 4f.
$$60 - 54 = 6$$ electrons to fill after Xe core.
First, 6s is filled: 2 electrons → $$6s^2$$ (4 remaining)
Then, 4f is filled: 4 electrons → $$4f^4$$
Electronic configuration: $$[Xe]\,4f^4\,6s^2$$.
The correct answer is Option 1: $$[Xe]\,4f^4\,6s^2$$.
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