SME
Grade 10 Science · Problem type
Models of the atom, in order
Use this for “How did the model of the atom change, and what evidence changed it?”
Put in order
Put the models of the atom in the order they were proposed.
1
?
2
?
3
?
4
?
5
?
Assumptions
•
Each span is how many years the model stood before the next one replaced it.
•
A new model came from new evidence: the electron, the gold-foil experiment, the lines in hydrogen’s spectrum.
•
Bohr’s model is like the Solar System: a heavy center with lighter electrons going around it, and mostly empty space.
•
Unlike planets, electrons can only be on certain levels and jump between them, and electric attraction holds them, not gravity.
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Average atomic mass from isotopes
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Electrons in atoms: energy levels, electron configuration and light
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Related lessons
Atomic structure and isotopes
Main lesson
Ions: gaining and losing electrons
Use this to find an ion’s charge from its protons and electrons, or the electrons from its charge.
Average atomic mass from isotopes
Use this for “Boron is 19.9% boron-10 (10.01 u) and 80.1% boron-11 (11.01 u). Find its atomic mass.”