elements upto atomic number 103 have been

Question

Elements upto 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:

(1) [Rn] 5 f ¹⁴, 6d⁴, 7s²                 

(2)  [Rn]5 f ¹⁴ 6d¹, 7s², 7p³            

(3) [Rn]5 f ¹⁴ 6d⁶, 7s⁰  

(4)  [Rn]5 f ¹⁴ 6d⁵, 7s¹

Ans:  [Rn]5 f ¹⁴ 6d⁵, 7s¹