The IUPAC nomenclature of an element with electronic configuration...

IUPAC nomenclature has been recommended for all the elements with $Z > 100$. It was decided by IUPAC that the names of elements beyond atomic number $100$ should use Latin words for their numbers. The names of these elements are derived from their numerical roots.

Numerical	$0$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$
roots	nil	un	bi	tri	quad	pent	hex	sept	oct	en

The atomic mass of given molecule $[ Rn ] 5{f}^{14}6{d}^{1}7{s}^{2} = 86 + 14 + 1 + 2 = 103$

Name of element with this atomic number $= un + nil + tri + ium = unniltrium$