1
Q
Dalton first discovered a…
A
simple ball.
2
Q
Thomson then discovered a …
A
first model to contain electrons.
3
Q
Rutherford then discovered that the…
A
nucleus and that it has a positive charge.
4
Q
Bohr discovered…
A
that the number of electrons in the outer shell determines the properties of an element.
he also discovered that they orbit the nucleus separately.
Chemistry yr 9
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