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# Unit 4: How do we determine the age of fossils?

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Unit test

Also, the mass of the nucleus is less than the total mass of the protons and neutrons inside it! - How?!

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- Identifying the type of decayGet 3 of 4 questions to level up!
- Predicting products and reactants in nuclear reactionsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Learn

### Practice

- Half-life (qualitative)Get 3 of 4 questions to level up!
- Half life (intermediate)Get 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

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