15 Questions
What is the definition of the atomic number of an atom?
The number of protons in the nucleus
What is the term for atoms with the same number of protons but different numbers of neutrons?
Isotopes
Who conducted the experiment that led to the discovery of sub-atomic particles?
JJ Thomson
What is the name of the experiment that led to the discovery of the nucleus of an atom?
The α-particle scattering experiment
Who suggested the name 'electron' for negatively charged particles?
Johnstone Stoney
What is the Law of Conservation of Mass related to?
Chemical reactions
What is the purpose of the Maltese Cross experiment?
To study the properties of cathode rays
What is the definition of the relative atomic mass of an element?
The average mass of an atom of the element relative to 1/12 the mass of an atom of carbon-12
Who developed the Bohr model of the atom?
Niels Bohr
What is the primary difference between the atomic number and the mass number of an atom?
The sum of protons and neutrons in the nucleus
Which scientist's experiment led to the conclusion that sub-atomic particles exist?
JJ Thomson's cathode ray experiment
What is the significance of the oil drop experiment conducted by Robert Milikan?
It measured the charge of an electron
What is the primary characteristic of isotopes of an element?
They have the same number of protons but different numbers of neutrons
What is the main conclusion drawn from the results of Ernest Rutherford's alpha-particle scattering experiment?
The structure of the atomic nucleus
What is the principle on which a mass spectrometer operates?
The mass spectrometer works on the principle that ions can be separated according to their mass.
Test your understanding of atomic theory concepts, including atomic number, mass number, isotopes, and relative atomic mass. Explore the fundamental principles of chemistry and the work of John Dalton.
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