Chemical element, atomic number 17. Used in contexts such as water purification, disinfectants, and industrial chemistry.
Tap water contains chlorine.
Chlorine is added to tap water to disinfect it.
The pool water is disinfected with chlorine.
There was a smell of chlorine coming from the pool.
塩素 names the raw chemical element, whereas 次亜塩素酸 is a specific chlorine-based compound used as a disinfectant.
塩素 refers to the element chlorine itself, while 塩化 describes the chemical process of turning something into a chloride or the chloride prefix used in compound names.
From 塩 (salt) + 素 (element), coined in the Meiji era as a calque of 'chlorine' (from Greek 'chloros', greenish-yellow).
chlorine detonating gas
chlorine gas poisoning