History of the atom Flashcards
(15 cards)
Who proposed the first atomic theory in 1803?
John Dalton
True or False: The atom was first theorized by ancient Greek philosophers.
True
What did J.J. Thomson discover in 1897?
The electron
Fill in the blank: The nucleus of an atom was discovered by _____ in 1911.
Ernest Rutherford
What model of the atom did Niels Bohr propose?
The planetary model
Multiple choice: Which particle was discovered by James Chadwick in 1932? A) Proton B) Electron C) Neutron D) Photon
C) Neutron
What concept did Max Planck introduce in 1900 that relates to the energy of atoms?
Quantum theory
True or False: Atoms are indivisible according to Dalton’s atomic theory.
True
What is the charge of an electron?
Negative
Fill in the blank: The modern atomic model incorporates principles from _____ mechanics.
Quantum
Who is known for the gold foil experiment that led to the discovery of the atomic nucleus?
Ernest Rutherford
What did the discovery of isotopes in the early 20th century reveal about atoms?
Atoms of the same element can have different numbers of neutrons.
Multiple choice: Which of the following scientists developed the uncertainty principle? A) Niels Bohr B) Albert Einstein C) Werner Heisenberg D) Max Planck
C) Werner Heisenberg
What is the primary component of an atom’s nucleus?
Protons and neutrons
True or False: The term ‘atom’ comes from the Greek word ‘atomos’, meaning ‘indivisible’.
True
