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VocabJLPT N1

ion

Noun

Definitions

1. ion
2. Ion

This katakana word is the scientific and everyday term for an electrically charged atom or molecule. It is used in chemistry, physics, and also in everyday product names and advertising, such as air purifiers or health products that claim to produce negative versions of these particles. It is borrowed directly from the English scientific term.

Example sentences

Sentence 1

The department head said, "We need a membrane that selectively passes ions."

Sentence 2

Wait — an ion is just an atom that's lost an electron, right?

Sentence 3

I recorded the ratio of cations to anions in my lab notebook.

Sentence 4

A prefectural survey confirmed that ion concentrations in the groundwater are within safe limits.

Sentence 5

First, please bring the ion source vacuum level up to the specified value.