13 Questions
What is the definition of an atomic number?
The number of protons in the nucleus of an atom.
How is the mass number of an atom calculated?
By summing the number of protons and neutrons in the nucleus.
What is the difference between isotopes of the same element?
They have the same number of protons but different numbers of neutrons.
What is the Law of Conservation of Mass, as stated by John Dalton?
Atoms cannot be created or destroyed in the course of a chemical reaction.
What was the significance of J.J. Thomson's cathode ray experiment?
It showed that sub-atomic particles existed and that cathode rays are negatively charged.
What was the purpose of Ernest Rutherford's α-particle scattering experiment?
To study the structure of the atomic nucleus.
Who is credited with suggesting the name 'electron' for negatively charged particles?
Johnstone Stoney.
What was the significance of Robert Milikan's oil drop experiment?
It determined the charge on an electron.
What is the main feature of Niels Bohr's model of the atom?
The Bohr model describes the energy levels of electrons in an atom.
What is the significance of John Dalton's law of conservation of mass in the context of atomic theory?
It states that atoms cannot be created or destroyed in a chemical reaction, and it is a fundamental principle that explains the conservation of mass during chemical reactions.
What are the five processes involved in the operation of a mass spectrometer?
Vaporisation, Ionisation, Acceleration, Seperation, Detection
What is the principle that the mass spectrometer operates on?
The mass spectrometer works on the principle that ions can be separated according to their mass.
What is Jammes Chadwick credited with discovering?
Discovering the existence of neutrons
Test your knowledge of atomic theory, including atomic number, mass number, isotopes, and relative atomic mass. Learn about the basics of atomic structure and the contributions of John Dalton. Assess your understanding of the fundamental principles of chemistry!
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