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Atomic Particles and Discoveries

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Questions and Answers

Which particles of an atom are positively charged?

Positrons

Electrons

Neutrons

Protons (correct)

Who discovered that the nucleus contains positively charged particles called protons?

James Chadwick

Niels Bohr

Ernest Rutherford (correct)

Democritus

Who discovered the electron?

John Dalton

Joseph Thomson (correct)

Democritus

Niels Bohr

What is the atomic number defined as?

<p>The number of protons</p> Signup and view all the answers

What is the mass number defined as?

<p>The number of protons and neutrons</p> Signup and view all the answers

Atomic Particles and Discoveries

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Questions and Answers

Which particles of an atom are positively charged?

Who discovered that the nucleus contains positively charged particles called protons?

Who discovered the electron?

What is the atomic number defined as?

What is the mass number defined as?

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