Atom Nucleus

Negatively charged particle, discovered by J.J.Thomson

• Electron

• Proton

• Neutron

Positively charged, it has the mass of about 1840 times that of an electron.

• Electron

• Proton

• Neutron

It doesn’t carry any charge (neutral), discovered by James Chadwick (1932), its mass is nearly the same as the proton.

• Protons

• Electron

• Neutrons

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NGSS.HS-PS1-8

He used alpha particles as a narrow beam directed to a thin sheet of gold foil.

• J J Thomson

• Rutherford

• Bohr

Named the nucleus as the tiny central core of an atom composed of protons and neutrons.

• Rutherford

• Bohr

• Chadwick

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NGSS.HS-PS1-8

Rutherford stated that’’ In the nuclear atom, the protons and electrons are located in the positively charged nucleus. The neutrons are distributed around the nucleus and occupy almost all the volume of the atom’’.

• True

• False

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NGSS.HS-PS1-8