Chem Unit 1.3 -- Atomic Theory

Question 1

Name the four scientists. (hint: DTRB)

Answer 1

Dalton, Thomson, Rutherford, Bohr.

Question 2

What did Dalton discover?

Answer 2

• “plain cookie dough”
• all matter is made of atoms
• atoms can’t be created or destroyed
• all atoms from the same element are the same
• chemical reactions can rearrange atoms
• elements link to form compounds

Question 3

What did Thomson discover?

Answer 3

• “raisin bun”
• electrons are negatively charged particles
• cathad ray rube

Question 4

What did Rutherford discover?

Answer 4

• Nucleus: tiny, dense, positively charged centre
• proton: positively charged particle
• neutron: neutral particle
• gold foil exp.

Question 5

What did Bohr discover?

Answer 5

• electrons exist in organized shells/energy levels

- with applied electricity, electrons can jump to other levels.