Inside The Atom 8 th 2.1 The Story of the Atom. The Story of the Atom Element – substance that cannot be broken down into simpler substances Element –

Inside The AtomInside The Atom88thth 2.1 The Story of the Atom 2.1 The Story of the Atom

The Story of the AtomThe Story of the Atom Element – substance that cannot be Element – substance that cannot be

broken down into simpler substancesbroken down into simpler substances Atoms-make up elements and are made Atoms-make up elements and are made

up of subatomic particles.up of subatomic particles. John Dalton believed that atoms are John Dalton believed that atoms are

like hard spheres and same like hard spheres and same throughout.throughout.

William Crookes created the cathode William Crookes created the cathode ray tube and found charged particles.ray tube and found charged particles.

The Story of the AtomThe Story of the Atom

The Story of the AtomThe Story of the Atom J.J. Thomson used the cathode ray tube J.J. Thomson used the cathode ray tube

to determine that atoms have electrons to determine that atoms have electrons and protons.and protons.

Electrons - negatively charged Electrons - negatively charged particlesparticles

Protons – positively charged particles.Protons – positively charged particles. Thompson derived that atoms have Thompson derived that atoms have

positive and negative charges positive and negative charges scattered throughout.scattered throughout.


The Story of the AtomThe Story of the Atom Ernest Rutherford determined that Ernest Rutherford determined that

atoms have a nucleus using gold foil.atoms have a nucleus using gold foil. Nucleus – center of an atom containing Nucleus – center of an atom containing

protons and neutronsprotons and neutrons Neutrons – neutral (no) charged Neutrons – neutral (no) charged

particle.particle. Electrons travel outside of the nucleus Electrons travel outside of the nucleus

in a cloud called the Electron Cloud.in a cloud called the Electron Cloud. Electrons don’t stand still and travel Electrons don’t stand still and travel

close to the nucleus.close to the nucleus.





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Inside The Atom 8 th 2.1 The Story of the Atom. The Story of the Atom Element – substance that cannot be broken down into simpler substances Element –