Elements up to atomic number $103$ have been synthesized and studied. If a newly discovered element is found to have an atomic number $106,$ its electronic configuration will be
- A$[Rn] 5f^{14} 6d^4 7s^2$
- B$[Rn] 5f^{14} 6d^1 7s^2 7p^3$
- C$[Rn] 5f^{14} 6d^6 7s^0$
- D$[Rn] 5f^{14} 6d^4 7s^2$
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