Scientists
Formulator of the theory of atomism.
Who is John Dalton?
_____ are not dense spheres but consist of smaller particles.
What are atoms?
The negatively charged particle.
What is the electron?
_____ were not included in the 1913 Bohr Model as they were discovered years later.
What are neutrons?
Democritus named the smallest unit of matter "Atomos," meaning ________.
What is Indivisible?
An ancient philosopher who named the smallest piece of matter "atomos."
Who is Democritus?
Dalton's theory states that ______ are combinations of two or more different types of atoms.
What are compounds?
The proton has a _____ charge.
What is positive?
The Cathode-Ray experiment concluded that the ratio of charged particles to ____ is always the same and negatively charged.
What is mass?
Charged particles
What are ions?
Used the Cathode-Ray Tube experiment to determine the presence of electrons.
Who is JJ Thomson?
All matter is composed of atoms, is indivisible, and are indestructible building blocks.
What is the theory of atomism?
The nucleus has a ______ charge.
What is positive?
This experiment led to the discovery of the nucleus.
What is Rutherford's Gold Foil Experiment?
As suggested by the discoveries of subatomic particles, the atom is not ________.
What is indivisible?
The physicist who discovered the presence of a dense nucleus (positively charged) but did not account for the properties of the electron in his model.
Who is Ernest Rutherford?
All atoms of a(n) ________ are alike in mass and other properties, but the atoms of one ________ differ from all other ________.
What is an element?
The subatomic particle discovered by James Chadwick.
What is a neutron?
The model that shows electrons orbiting the nucleus in circular paths.
What is the Bohr Model?
Democritus proposed his theory in _____.
What is 400 BCE?
The scientist who experimented with beryllium atoms and alpha particles until an unknown radiation was produced; the radiation was composed of and identified as neutrons.
Who is James Chadwick?
According to Democritus, all atoms are ______ in number, always moving, and joining together.
What is infinite?
J.J. Thomson discovered the electron in the year of _____.
When is 1932?
According to this model, the atom is a sphere of positive charge, and negatively charged electrons are embedded in it to balance the total positive charge.
What is the Chocolate Chip Cookie model?
The Atomic Theory led to the creation of the Law of Multiple _______.
What are Proportions?