1370. These characters seem elementary! Why? 塩 鉄 金 銅 亜+鉛

Answer:

塩  EN, shio - salt

鉄  TETSU - iron

金  KIN, kane - gold

銅  DOU - copper

亜+鉛  A - rank, next, come after, Asia

They all represent chemical elements.

塩素  ENSO - Chlorine

鉄  TETSU - iron

金  KIN, kane - gold

銅  DOU - copper

亜鉛  AEN - Zinc