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atoms and radiation - Coggle Diagram
atoms and radiation
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model atom
Our understanding of atoms has improved over time. The models that we have used to understand atoms have also changed.
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The modern model
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In 1932, James Chadwick discovered that some particles in the nucleus have no charge at all. He called them neutrons.
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atoms and ions
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Atoms have no overall electrical charge. When an atom becomes charged by gaining or losing electrons it becomes an ion.
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Atoms are neutral
In an atom, the number of electrons is equal to the number of protons in the nucleus.
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Electron Arrangements
Electrons are arranged in shells around a nucleus. Each shell has a different energy level. When an atom absorbs or emits electromagnetic radiation, its electron arrangements can change.
Absorb radiation
When atoms absorb electromagnetic radiation, electrons move to a higher energy level further away from the nucleus.
Emit radiation
When atoms emit electromagnetic radiation, electrons can drop to a lower energy level, closer to the nucleus.
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Atomic Model
An atom has a small, positively-charged nucleus surrounded by orbiting negatively-charged electrons.