20 Questions
Who discovered the presence of new radiations in a gas discharge and called them canal rays?
E. Goldstein
What did E. Goldstein's discovery of canal rays ultimately lead to?
Discovery of another sub-atomic particle
What are the charged particles that make up an atom?
Protons and electrons
What is the charge of a proton?
+1
What is the mass of an electron compared to that of a proton?
Negligible compared to the mass of a proton
What was the big question about the structure of the atom?
Are atoms really indivisible, or are there smaller constituents inside them?
Who was the first scientist to propose a model for the structure of an atom?
J.J. Thomson
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.
What led to the failure of Dalton's atomic theory regarding the indivisibility of atoms?
The discovery of electrons and protons inside the atom.
What was one of the first indications that atoms are not indivisible?
Studying static electricity and the conduction of electricity by different substances.
What sub-atomic particle did J.J. Thomson identify?
Electron
What did E. Goldstein discover in 1886 in a gas discharge?
Canal rays
What is the charge of a proton?
Plus one
How does the mass of an electron compare to that of a proton?
Negligible compared to the mass 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?
Proton
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
Who was the first scientist to propose a model for the structure of an atom?
J.J. Thomson
What did Dalton's atomic theory propose about the atom?
That the atom was indivisible and indestructible
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
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
Explore the concept of charged particles in atoms and the divisibility of atoms through this quiz, which delves into the contributions of various scientists. Discover the origins of electrical charge and the revelation of sub-atomic particles within atoms.
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