The Building Blocks: Atomic Structure
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The Building Blocks: Atomic Structure
The particle key
An atom has a tiny, dense nucleus containing positively charged protons and neutrons, which have no electrical charge. Electrons occupy regions around the nucleus called shells. The diagram is a simplified model, not drawn to scale: the central circle represents the nucleus, and the surrounding circles represent electron shells.
- Proton
- Neutron
- Electron
- Nucleon
Decode the atom cards
Atomic number = number of protons. Mass number = number of protons + number of neutrons. In a neutral atom, number of electrons = number of protons. The element with atomic number 9 is fluorine.
CARD A Element: carbon Atomic number: 6 Mass number: 12
CARD B Element: sodium Atomic number: 11 Mass number: 23
CARD C Element: oxygen Atomic number: 8 Mass number: 16
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