Question

which of these is not a contribution made by Thomson?
a) discovery of electron
b) discovery of atomic nucleus
c) atom is electrically neutral
d) plum pudding model​

Answer 1

Answer:

a, c....................

Answer 2

The correct answer is option (b). discovery of atomic nucleus.

• Through the cathode ray tube (CRT) experiment, J.J. Thompson discovered in 1897 that an atom contains electrons.
• He also discovered that atoms are electrically neutral entities.
• In 1904, Thompson proposed the water melon or plum pudding atom model following the discovery of electrons.
• According to the plum pudding model, the negatively charged electrons are embedded in the sea of positive charge that occupies most of the atom.
• Through the gold foil experiment, Ernest Rutherford and his students, Marsden and Geiger, discovered the atom's nucleus in 1911.
• Strong nuclear force holds the electrically positive protons and electrically neutral neutrons that make up atomic nuclei together.

#SPJ2