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Inside an Atom
Age 11 · Chemistry
An atom has a tiny, dense center called the nucleus. Around it, even smaller electrons move, held by the electric pull from the center.
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Age 11: open this week
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In the picture
- Red sphere in the central cluster: a proton, which carries a positive electric charge.
- Gray sphere in the central cluster: a neutron, which has no electric charge.
- Central cluster: the nucleus, the dense core of the atom.
- Blue sphere on a looping path: an electron, which carries a negative electric charge and is held by electric attraction.
Examples
- The helium inside a party balloon is made of helium atoms.
- A copper wire contains many copper atoms, each with a nucleus and electrons.
Key takeaways
- Atoms are mostly empty space around a very small, dense nucleus.
- Protons are positive, electrons are negative, and their electric attraction keeps electrons around the nucleus.
Quiz: Inside an Atom (Age 11)
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What is the dense core at the center of an atom called?
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Which part of an atom has no electric charge?
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What keeps electrons around the nucleus?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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