氮

Mnemonic symbol: a balloon. The Queen of Hearts is disappointed by her balloons. She expected them to float upwards, but in the space station's bathroom, They float randomly in all directions.

炎 = 火 : Mnemonic symbol: As I just learned "itis" is the feeling you get after eating too much.

Maud Younger (y) ate too much in the anthill's kitchen (an2). She's having the itis (炎) so hard that she doesn't even wake up from the fire (火) which is spreading fast.