塩素

1. Origins, structure, and basic meaning

• Structure: 塩素 is read as えんそ and is the noun for the chemical element chlorine.
• Basic usage: Its odor appears in 塩素の匂い, while inclusion in a substance appears in 塩素を含む薬品.

2. Common pitfalls and similar expressions

• Element and chemical product
  • 塩素 names an element, whereas 塩素を含む薬品 is a chemical product that contains it.
• Describing an odor
  • The pattern 塩素の匂いがする states that something has or gives off a chlorine smell.