Radioactivity- Atoms

Question 1

What is the first model of the atom and who discovered it?

Answer 1

Plum pudding model discovered by JJ Thompson in 1897.

Question 2

Positive _______ (protons and neutrons) surrounded by negative _________ in ______, discovered by __________.

Answer 2

Positive nucleus (protons and neutrons) surrounded by negative electrons in shells, discovered by Rutherford.

Question 3

How did Rutherford disprove the plum pudding model?

Answer 3

Rutherford disproved plum pudding model by firing alpha particles at gold foil. The
wide scattering pattern suggested the nucleus.

Question 4

Electrons can jump to a ______ energy level (further from the _______) with
absorption of ______________ radiation.

Answer 4

Electrons can jump to a higher energy level (further from the nucleus) with
absorption of electromagnetic radiation.

Question 5

Describe what the plum pudding model was like

Answer 5

A mass of positive charge with negative charged electrons dotted about.