P1.1 The Particle Model

Question 1

Dalton’s model(1870s)

Answer 1

Very small indestructible sphere

• all the atoms in the element are the same
• the atoms in one element are different from the atoms in all other elements

Question 2

Thomson’s model (1897)

Answer 2

Positive mass with negative electrons embedded in it

- no overall electrical charge, neutral

Question 3

Rutherford model(1899)

Answer 3

Very small positive nucleus with electrons in orbit around it

Question 4

Bohr Model (1913)

Answer 4

Very small positive nucleus with electrons in shells around it