next question if JJ Thomson had discovered electron then why don't he wore able to discovered proton also..
Answers
Answer:
I don't know
Explanation:
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Answer:
J. J. Thomson found electrons in atoms (1897) by extracting them from a gaseous discharge and
bending them in magnetic fields. This let him find their charge/mass ratio.
Thomson suggested (1898) that atoms consist of positively charged lumps of matter with electrons
embedded in them. ("Raisin pudding.")
This model may seem silly now, but, as we will see soon, some of the later, more sophisticated
models of the atom led to some very serious problems.
Geiger and Marsden (1911) shot alpha particles at thin (much less than the thickness of a human hair)
gold foils. Alpha particles are helium atoms minus their electrons, so they have a charge of +2e.
In the Thomson model, the electric charge is smeared out over the atomic volume, and no (or
very weak) interaction is expected between the charged alpha particles and the gold atoms.
That's because there is no local electric field to deflect a charged particle.
Most of the alpha particles went on through with no interaction, but some of them scattered at
large angles, and some even scattered through an angle of 180.
That result was totally unexpected. The experiment led Rutherford to develop his model for
the atom, in which the atom's positive charge and mass are concentrated in a very small
nucleus, with the electrons some distance away.
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