History Of The Atom Flashcards

1
Q

What are atoms made of?

A

Protons, neutrons and electrons.

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2
Q

What are protons?

A

Positively charged particles found in the nucleus.

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3
Q

What are neutrons?

A

Neutral particles found in the nucleus.

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4
Q

What are electrons?

A

Negatively charged particles that orbit the nucleus.

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5
Q

What did Democritus discover?

A

Democritus is an Ancient Greek philosopher who was the first to propose the theory of the atoms in 400.B.C

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6
Q

What did John Dalton do?

A

He described the atoms as solid balls.

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7
Q

What did JJ Thomson do?

A

Concluded for his experiments that atoms arenโ€™t solid spheres.

His measurements of charge and mass show that an atom contains smaller, negatively charged particles, later on named particles.

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8
Q

What did Rutherford do?

A
  • That the atom is mostly empty space, majority of the mass coming from the nucleus.
  • All of the positive charge comes from the nucleus
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9
Q

What did Chadwick do?

A

He discovered neutrons. He found out the neutron was neither positively or negatively charged but rather was neutral. He discovered that neutrons are located in the centre, inside the nucleus

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