Atomic Number of Potassium
This page is the CodyCross answer for the clue below from Inside the Spaceship, Group 1188, Puzzle 5 (Throwback Eras).
Question is: Atomic Number of Potassium
and the answer is: NINETEEN
Word Meaning:
NINETEEN — The cardinal number occurring after eighteen and before twenty, represented in Roman numerals as XIX and in Arabic numerals as 19. It is the last/largest of the "teens".
Definitions from Wiktionary.