The Changing Atom

Question 1

What was the findings by Dalton in the early 1800s

Answer 1

• Atoms are tiny particles making up elements

* they can’t be divided and all atoms of a given element are the same

Question 2

JJ Thomson findings and model 1887-1906

Answer 2

• disproved the Greeks and dalton by finding electrons that had a negative change and a very small mass
• Plum pudding model of atoms being made up of negative electrons moving around a sea of positive charge

Question 3

1909-11 Rutherford finding

Answer 3

• measured deflection of alpha particles

* some deflected at angles so he concluded positive ones were at a nucleus

Question 4

1913 Bohr findings

Answer 4

He discovered shells so electrons didn’t spill into nucleus

Question 5

1932 James Chadwick

Answer 5

Discovers neutron from looking at radiation