1. The majority of the mass of an atom is concentrated in the...
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2. When an atom is charged it is then an...
3. Fill in the gaps...Electrons are - and - charged.
- Heavy and positively
- Heavy and negatively
- Tiny and negatively
- Tiny and positively
4. Fill in the gaps...It's the number of - in an atom that determines what element it is.
5. How big are atoms?
- Medium sized