Update 5_atoms_and_lcao_solutions.md - typo

src/5_atoms_and_lcao_solutions.md

@@ -12,7 +12,7 @@
   \textrm{Cu} &= [\textrm{Ar}]4s^23d^9\\
   \textrm{Pd} &= [\textrm{Kr}]5s^24d^8\\
   \textrm{Ag} &= [\textrm{Kr}]5s^24d^9\\
-  \textrm{Au} &= [\textrm{Xe}]6s^24f^145d^9
+  \textrm{Au} &= [\textrm{Xe}]6s^24f^{14}5d^9
   \end{align}
   $$