Developing Ideas Of The Atom

Question 1

What is Democritus understanding of the atom?

Answer 1

Atoms are tiny and cannot be divided further

Question 2

What is explained in Bohr’s planetary model of the atom?

Answer 2

Provided an explanation for the difference in energy of electrons at different distances from the nucleus

Question 3

What did Ernest Rutherford discover with the Alpha particle scattering experiment?

Answer 3

• protons
• The mass and charge is concentrated in the centre
• majority of the the atoms volume came from the space between the nucleus and the electrons that orbit
• the positive and negative charges balance to make the atom neutral

Question 4

What did Rutherford and Bohr propose?

Answer 4

Rutherford proposed electrons orbit the nucleus whilst Bohr proposed electrons orbit the nucleus on clear paths

Question 5

What is the modern day model of the atom?

Answer 5

• atom composed of subatomic particles

- protons and neutrons found in nucleus

Question 6

What did Chadwick discover?

Answer 6

The nucleus