Isotope
Atoms of the same element that have the same number of protons but different numbers of neutrons, giving them different mass numbers. Some isotopes are radioactive (C-14 for dating); some are used in medicine.
💡 Intuition
Same element, slightly different weight. Chemically identical, but different mass.
Core Idea
Isotopes have the same atomic number but different mass numbers.
🔬 Example
🎯 Why It Matters
Some isotopes are radioactive (C-14 for dating); some are used in medicine.
⚠️ Common Confusion
Isotopes of an element behave identically in chemical reactions.
How to Use Isotope
When this concept appears in chemistry, it usually controls how you interpret a representation, a quantity, or a change in a system. Students make faster progress when they can explain what isotope tells them before reaching for an equation or memorized phrase.
A strong self-check is to say what isotope does, what it does not do, and which nearby idea it is easiest to confuse with. That kind of explanation makes later calculations, lab reasoning, and compare pages much more reliable.
Related Concepts
Prerequisites
Next Steps
How Isotope Connects to Other Ideas
To understand isotope, you should first be comfortable with neutron and mass number. Once you have a solid grasp of isotope, you can move on to radioactivity.
Go Deeper
Frequently Asked Questions
What is Isotope in Chemistry?
Atoms of the same element that have the same number of protons but different numbers of neutrons, giving them different mass numbers.
Why is Isotope important?
Some isotopes are radioactive (C-14 for dating); some are used in medicine.
What do students usually get wrong about Isotope?
Isotopes of an element behave identically in chemical reactions.
What should I learn before Isotope?
Before studying Isotope, you should understand: neutron, mass number.