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.
