3. What Makes an Atom Become an Ion?

3. What Makes an Atom Become an Ion?

Aug 24, 2026·
Xander Chu
Xander Chu
· 1 min read
psychology

Key Question

What makes an atom become an ion?

What You’ll Learn

  • The difference between an atom and an ion
  • How gaining or losing electrons changes electrical charge
  • What cations and anions are
  • Why sodium, potassium, chloride, and calcium matter in neurobiology

Key Takeaway

An ion is an atom or molecule with a net electrical charge.

That charge allows ions to respond to electrical forces — one of the foundations of neuronal signalling.

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Xander Chu
Authors
Xander Chu (they/them)
Founder, XC Psych
Psychology student at UNSW exploring psychology and neurobiology from first principles, with a background in data science, machine learning, software engineering, and tennis coaching.