'In the symbol of the colorless, odorless gas whose atomic number is 36'
R (KR - krypton)
LETTER AFTER K: In the symbol of the colorless, odorless gas whose atomic number is 36
In the symbol of the colorless, odorless gas whose atomic number is 36
In the symbol of the colorless, odorless gas whose atomic number is 36
LETTER AFTER K
R KR - krypton
LETTER AFTER K