Atomic Theory Flashcards
What is the smallest unit of matter that retains the properties of an element?
Atom
Who proposed the first atomic theory in the early 19th century?
John Dalton
True or False: The atomic theory states that atoms are indivisible and indestructible.
True
Fill in the blank: Dalton’s atomic theory included the idea that all atoms of a given element are ______.
identical
What did J.J. Thomson discover in 1897?
The electron
Multiple Choice: Which scientist is known for the gold foil experiment?
Ernest Rutherford
What model of the atom did Niels Bohr propose?
The Bohr model, which depicts electrons orbiting the nucleus in defined paths.
True or False: The neutron was discovered before the proton.
False
Fill in the blank: The modern atomic theory includes the concept that atoms can be split, leading to ______.
nuclear reactions
What is the charge of a proton?
Positive
Who is credited with the discovery of the neutron?
James Chadwick
Multiple Choice: Which of the following scientists introduced the concept of quantized energy levels?
Niels Bohr
What did the plum pudding model describe?
A model of the atom where electrons are embedded in a positively charged ‘soup’.
True or False: Atoms are composed of protons, neutrons, and electrons.
True
What is the primary component of an atom’s nucleus?
Protons and neutrons
