元素（げんそ、genso）
- element

The Japanese word 元素 (げんそ, gensō) means "element" in the context of chemistry and the periodic table. It refers to a pure substance that cannot be broken down into simpler substances by chemical means. Each 元素 is defined by the number of protons in its atomic nucleus (the atomic number). The word also broadly applies to foundational or fundamental aspects of something, akin to the building blocks.

⚫︎水素（すいそ）は最も軽い元素です。 Translation: Hydrogen is the lightest element. ⚫︎金（きん）は美しい元素として知られています。 Translation: Gold is known as a beautiful element. ⚫︎彼女はその物語の基本的な元素を理解している。 Translation: She understands the basic elements of the story.

This word is commonly used in scientific contexts, particularly in chemistry and physics. It's used when discussing the building blocks of matter. It can also be used metaphorically to describe the essential or fundamental parts of something.

The word 元素 is typically written in kanji as 元素 and read as げんそ. There are no other common ways to write this word. The okurigana is fixed and there are no variations.

⚫︎ 要素 (ようそ, yōso) - element, factor, component (can sometimes be used as a synonym depending on the context).

There aren't direct antonyms for 元素 in the same scientific context. However, when used metaphorically, words like "complex" or "composite" could be considered opposites.

この物質は、炭素（たんそ）と酸素（さんそ）の二つの元素からできています。 ・Translation: This substance is made of two elements: carbon and oxygen. ・Explanation: This sentence describes the composition of a substance using the elements carbon and oxygen.

周期表には100以上の元素がリストされています。 ・Translation: Over 100 elements are listed in the periodic table. ・Explanation: This sentence refers to the periodic table and the elements within it.

The word 元素 is a compound word. 元 (げん, gen) means "origin," "source," or "foundation," and 素 (そ, so) means "element," "ingredient," or "basic." Therefore, the literal meaning is something like "basic element" or "fundamental element." The term was adopted from the study of chemistry and science, to translate the English term "element" into Japanese.