Rarest Natural Element on Earth, Symbol at

This page is the CodyCross answer for the clue below from Culinary School, Group 2202, Puzzle 5 (Emulsifying).

Question is: Rarest Natural Element on Earth, Symbol at

and the answer is: ASTATINE

Word Meaning:

ASTATINE — A highly radioactive chemical element (symbol At), one of the halogens, with atomic number 85.

Definitions from Wiktionary.