Atom (History and Structures) Flashcards
He is the Father of the Modern Atomic Thought
Democritus
Proposed that matter was made of different amounts of elements: earth, water fire, air, and ether.
Aristotle
Small, hard particles that made up matter
atomos
Viewed atoms as tiny, solid “billiard” balls
John Dalton
Father of Modern Atomic Theory
John Dalton
Discovered electrons
J.J. Thomson
This experiment led to the discovery of electrons
Cathode Ray Tube Experiment
What do raisins represent in the raisin bun model?
Electrons
What was the experiment that led to the discovery of nucleus?
Gold Foil Experiment
True or False:
Atoms are mostly made up of empty space.
True
Who discovered the existence of protons and nucleus?
Ernest Rutherford
He proposed the planetary model in which stated that electrons move around the nucleus in specific layers or orbitals.
Niels Bohr
True or False:
James Chadwick was the one who discovered the nucleus.
False
Who discovered the particles with no charge?
James Chadwick
True or False:
According to Werner Heisenberg and his uncertainty principle, we cannot determine the position of an electron at a certain time.
True
A model proposed by modern scientists where it is impossible to know where an electron is at any given time.
Electron Cloud Model (The Modern Model)
What is in the center of an atom?
Nucleus
Modified True or False:
Molecules are the smallest particle of an element.
False. It should be atoms.
What is the building block of an element?
Atom
Enumerate the subatomic particles.
Protons, Neutrons, and Electrons
True or False:
The number of protons are equal to the number of electrons.
True
They make up for almost all the mass of an atom.
Protons and Neutrons
These are orbiting around the nucleus and have very little mass.
Electrons
These are the smallest particles of an atom, along with electrons, that made up protons and neutrons.
Quarks
