# Chemistry Subatomic particles

posted by Joey

Fill in the chart
(Numbers correspond to each other[I.E 1 in 1st group connects with 1in 2nd])
Subatomic particle found
1.Proton
2.Neutron
3.Electron
Scientist
1.Rutherford
3.Thomson
Experiment
1.Gold Foil Experiment?
2.?
3.Cathode Ray Tube
Data Supporting Discovery
1.?
2.?
3.?
How to calculate each?
1. atomic Number
2. Atomic Mass-Atomic Number
3. Atomic number-Charge

1. DrBob222

Here is a good link for neutrons. Experimental data came in about 1932 from scattering experiments in which Be metal was bombarded with alpha particles.
http://hyperphysics.phy-astr.gsu.edu/hbase/particles/neutrondis.html

You can get dates for the other discoveries by Googling "discovery proton" or "discovery electron".

Do you have questions on how to calculate each at the end?

2. Joey

Two actually, for the "Data Supporting Discovery,"when it says data, does it mean I have to include a brief explanation about the experiment from the previous group?
And for the calculations, is that the "official" way to calculate them, or is there another way?

3. DrBob222

I think for the first, yes. Just a short summary of the work.

For the second I would make the following observations: The question isn't clear as to WHAT you are to calculate. Is it the number of p, n, e, or the charge, or the mass or just what. I assume it is the number of p, n, e.
1. proton. The number of protons in an element is the atomic number.
2. The number of neutrons is the mass number minus the atomic number. Note that mass number is the number protons + number of neutrons (both are whole numbers) while the atomic mass is seldom a whole number and is the average atomic mass of all of the natural isotopes of that element relative to carbon 12 set at 12.0000.
3. The number of electrons in an element is the same as the number of protons in that element; i.e., the number of electrons = atomic number = number of protons.

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