CREF 12 Flashcards
1
Q
Explain why most of the alpha particles passed through the gold foil.
A
Because atoms are mostly empty space so they just pass right through.
2
Q
Why did some alpha particles bounce back at 180?
A
Because it hits the nucleus. It is a dense centre with a positive charge.
3
Q
How is JJ Thomson’s model both similar and different from the nuclear model we have today.
A
Both have positive charge and negative charge. The atom charge is zero. Nuclear model has a central nucleus. Nuclear model has electrons orbiting the centre.
4
Q
Electrons obit around what
A
The nucleus
