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Worksheets4.2 Defining the Atom ม5
Total questions: 10
Worksheet time: 3mins
What sub-atomic particle has neither a positive nor a negative charge?
proton
neutron
electron
nucleus
Who discovered the electron?
Rutherford
Thomson
Milikan
Dalton
This is a model of what was thought be an atom - what is the model called?
Cathode Ray Tube Experiment
Gold Foil Experiment
Plum Pudding Model
Planetary Model
Millikan was able to calculate the charge on an electron & using the charge-to-mass ratio he calculated the mass. What measurements did he calculate?
1.6 x 10-19 C / 9.1 x 10-28 g
9.1 x 10-28 C / 1.6 x 10-19 kg
9.1 x 10-19 C / 1.6 x 10-28 g
1.6 x 10-28 C / 9.1 x 10-19 g
Imagine an atom which has had all of its electrons removed. What charge will the atom have?
All atoms are neutral
Negative charge
Positive charge
No charge
How do electrons remain suspended in the cloud surrounding the nucleus?
Reverse gravity prevent them from escaping
The outer shell of the cloud retains the electrons in situ
Electrstatic charges from other atoms repels the electrons
The negatively charged electrons are attracted to the positively charged nucleus
