Structure of the Atom: Charged Particles and Atomic Divisibility

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Who discovered the presence of new radiations in a gas discharge and called them canal rays?

Rutherford

J.J. Thomson

Bohr

E. Goldstein (correct)

What did E. Goldstein's discovery of canal rays ultimately lead to?

Discovery of another sub-atomic particle (correct)

Identification of the electron

Development of atomic theory

Discovery of protons

What are the charged particles that make up an atom?

Protons and electrons (correct)

Protons and positrons

Positrons and neutrons

Neutrons and electrons

What is the charge of a proton?

+1 Signup and view all the answers

What is the mass of an electron compared to that of a proton?

Negligible compared to the mass of a proton Signup and view all the answers

What was the big question about the structure of the atom?

Are atoms really indivisible, or are there smaller constituents inside them? Signup and view all the answers

Who was the first scientist to propose a model for the structure of an atom?

J.J. Thomson Signup and view all the answers

What did J.J. Thomson's model propose about the atom's structure?

Atoms consist of a positively charged sphere with electrons embedded in it. Signup and view all the answers

What led to the failure of Dalton's atomic theory regarding the indivisibility of atoms?

The discovery of electrons and protons inside the atom. Signup and view all the answers

What was one of the first indications that atoms are not indivisible?

Studying static electricity and the conduction of electricity by different substances. Signup and view all the answers

What sub-atomic particle did J.J. Thomson identify?

Electron Signup and view all the answers

What did E. Goldstein discover in 1886 in a gas discharge?

Canal rays Signup and view all the answers

What is the charge of a proton?

Plus one Signup and view all the answers

How does the mass of an electron compare to that of a proton?

Negligible compared to the mass of a proton Signup and view all the answers

What is the name given to the sub-atomic particle with a charge equal in magnitude but opposite in sign to that of the electron?

Proton Signup and view all the answers

What major challenge did scientists face at the end of the 19th century?

Revealing the structure of the atom as well as explaining its important properties Signup and view all the answers

Who was the first scientist to propose a model for the structure of an atom?

J.J. Thomson Signup and view all the answers

What did Dalton's atomic theory propose about the atom?

That the atom was indivisible and indestructible Signup and view all the answers

What was one of the first indications that atoms are not indivisible?

Studying static electricity and the condition under which electricity is conducted by different substances Signup and view all the answers

What did Thomson propose about the structure of the atom?

An atom consists of a positively charged sphere with electrons embedded in it, and the negative and positive charges are equal in magnitude Signup and view all the answers

Structure of the Atom: Charged Particles and Atomic Divisibility

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Questions and Answers

Who discovered the presence of new radiations in a gas discharge and called them canal rays?

What did E. Goldstein's discovery of canal rays ultimately lead to?

What are the charged particles that make up an atom?

What is the charge of a proton?

What is the mass of an electron compared to that of a proton?

What was the big question about the structure of the atom?

Who was the first scientist to propose a model for the structure of an atom?

What did J.J. Thomson's model propose about the atom's structure?

What led to the failure of Dalton's atomic theory regarding the indivisibility of atoms?

What was one of the first indications that atoms are not indivisible?

What sub-atomic particle did J.J. Thomson identify?

What did E. Goldstein discover in 1886 in a gas discharge?

What is the charge of a proton?

How does the mass of an electron compare to that of a proton?

What is the name given to the sub-atomic particle with a charge equal in magnitude but opposite in sign to that of the electron?

What major challenge did scientists face at the end of the 19th century?

Who was the first scientist to propose a model for the structure of an atom?

What did Dalton's atomic theory propose about the atom?

What was one of the first indications that atoms are not indivisible?

What did Thomson propose about the structure of the atom?

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