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Sagot :

Answer:

1.proton

2.electrons

3.neutron

4.pure element

5.scientist once thought the most fundamental building block of matter was a particle called the atom.Now we know that the atom is made of many smaller pieces,known as subatomic particles.Every atom contains a central core called the nucleus,made of particles called protons and neutrons

6.James Chadwick

7.Patrick Blackett

8.Thomson proposed a model,sometimes called the "plum pudding" or "raisin cake model",in which thousand of tiny,negatively charged corpuscles swam inside a sort of cloud of massless positive charge.This theory was struck down by Thomson's own former student,Ernest Rutherford

9.mass number

10.