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Atomic Structure: Discovery of Subatomic Particles

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Atomic Structure: Discovery of Subatomic Particles

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Questions and Answers

What occurs when atoms gain or lose electrons to increase their stability?

They lose their reactivity

They become charged entities called ions (correct)

They form a chemical bond

They become neutral

What is the primary reason for the unique characteristics of different elements?

The different atomic masses of their atoms

The different numbers of protons and electrons in their atoms (correct)

The number of electrons in their atoms

The number of neutrons in their atoms

Which scientist's work led to the discovery of subatomic particles?

John Dalton

J.J. Thomson (correct)

Niels Bohr

Ernest Rutherford

What is the purpose of the vacuum pump in the cathode ray experiment?

To maintain a partial vacuum (D) Signup and view all the answers

What is the result of chemical reactions according to Dalton's atomic theory?

A rearrangement of atoms to form products (C) Signup and view all the answers

What is the significance of Dalton's atomic theory?

It explained the Laws of chemical reactions (B) Signup and view all the answers

What is the main function of electrons in an atom?

To revolve around the centre of the nucleus (C) Signup and view all the answers

Who is credited with proposing the first scientific theory of atomic structure?

John Dalton (C) Signup and view all the answers

What is the atomic number of an element determined by?

The total number of protons in its nucleus (C) Signup and view all the answers

Which of the following is NOT a component of the atomic structure of matter?

Molecules (A) Signup and view all the answers

What is the significance of the study of atomic structure?

It provides a basis for understanding the entire class of chemical reactions and bonds (C) Signup and view all the answers

What is the characteristic of a neutral atom?

It has equal numbers of protons and electrons (C) Signup and view all the answers