First Element on Mendeleev's Periodic Table

This page is the CodyCross answer for the clue below from Architectural Styles, Group 1170, Puzzle 4 (Ben Van Berkel).

Question is: First Element on Mendeleev's Periodic Table

and the answer is: HYDROGEN

Word Meaning:

HYDROGEN — (uncountable) The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.

Definitions from Wiktionary.

First Element On Mendeleev's Periodic Table - Architectural Styles CodyCross Answers | CodyCross Solutions