20 Questions
Who was the first scientist to propose a model for the structure of an atom?
J.J. Thomson
What are canal rays according to the text?
Positively charged radiations
How are electrons and protons represented in general according to the text?
'e-' and 'p+'
What did Dalton's atomic theory suggest, which was contradicted by the discovery of electrons and protons?
Atoms are indestructible
What was the charge and mass of the sub-atomic particle discovered by E. Goldstein according to the text?
Charge: plus one, Mass: approximately 2000 times that of an electron
What was one of the first indications that atoms are not indivisible?
The study of static electricity
What did the scientists at the end of the 19th century aim to reveal?
The structure and properties of the atom
What is the fundamental building block of matter according to Chapter 3?
Atoms and molecules
What was one of the major challenges before the scientists at the end of the 19th century?
To reveal the structure of the atom and explain its properties
What does Chapter 4 aim to explain?
The arrangement of sub-atomic particles
What was the model proposed by J.J. Thomson for the structure of an atom?
Thomson proposed the model of an atom to be similar to that of a Christmas pudding.
Who discovered the presence of canal rays in a gas discharge?
E. Goldstein discovered the presence of canal rays in a gas discharge.
What is the charge and mass of a proton?
The charge of a proton is plus one and its mass is approximately 2000 times that of an electron.
How did the discovery of electrons and protons impact Dalton's atomic theory?
The discovery of electrons and protons inside the atom led to the failure of the aspect of Dalton's atomic theory that suggested the atom was indivisible and indestructible.
What did E. Goldstein's discovery of canal rays ultimately lead to?
E. Goldstein's discovery of canal rays ultimately led to the discovery of another sub-atomic particle known as the proton.
What were the two primary questions that arose regarding the structure of the atom?
What makes the atom of one element different from the atom of another element? Are atoms really indivisible, as proposed by Dalton, or are there smaller constituents inside the atom?
What was the major challenge faced by scientists at the end of the 19th century?
To reveal the structure of the atom as well as to explain its important properties.
What were some of the first indications that atoms are not indivisible?
The study of static electricity and the condition under which electricity is conducted by different substances.
What were the two activities suggested for understanding the nature of charged particles in matter?
Comb dry hair and observe if the comb attracts small pieces of paper. Rub a glass rod with a silk cloth and bring the rod near an inflated balloon.
What did scientists aim to elucidate based on a series of experiments at the end of the 19th century?
The structure of the atom and its important properties.
Test your knowledge about the structure of atoms and the differences between atoms of various elements. Explore questions about the indivisibility of atoms and the smaller constituents inside the atom.
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