Alphabetically Last Element in the Periodic Table

This page is the CodyCross answer for the clue below from Airport, Group 460, Puzzle 3 (Security Check Point).

Question is: Alphabetically Last Element in the Periodic Table

and the answer is: ZIRCONIUM

Word Meaning:

ZIRCONIUM — A chemical element (symbol Zr) with an atomic number of 40, a strong, lustrous, grey-white transition metal mainly used as a refractory and opacifier.

Definitions from Wiktionary.