Models
This model contains the newly discovered electron scattered throughout a positively charged “dough.”
Thomson‘s cookie model
He theorized that the electrons travelled in rings around the nucleus and could jump from rings, but not in between.
Niels Bohr
The center of the atom.
Nucleus
Everything is made of small particles that cannot be broken down further.
Democritus’ theory
Which two scientists were students of J.J. Thomson?
Ernest Rutherford and Niels Bohr
The model that showed that electrons orbit the nucleus at certain distances, and they could jump directly to each orbit, but not in between.
Niels Bohr’s model
He discovered the neutron.
James Chadwick
Positively charged particles that lie in the middle of an atom.
Protons
This four-part theory was the first Atomic Theory.
John Dalton’s theory
These two scientists were knighted.
J.J. Thomson and James Chadwick
This model contains a nucleus made up of both protons and neutrons, while also showing that electrons can move more freely and unpredictably around the outside.
James Chadwick’s model
He discovered electrons.
J.J. Thomson
Particles in the nucleus of an atom without any charge.
Neutrons
An atom is a ball of positively charged energy that consists of small negatively charged particles throughout.
J.J. Thomson’s theory
This scientist was born in New Zealand.
Ernest Rutherford.
This model showed that the atom was made up of mostly empty space with a nucleus in the center and electrons surrounding it.
Ernest Rutherford’s model
This Greek philosopher theorized the existence of an uncuttable unit of matter.
Democritus
The outer part of an atom, where a certain particle rapidly moves.
Electron cloud
Atoms have mostly empty space with a nucleus in the center and electrons surrounding it.
Ernest Rutherford’s theory
This scientist studied quantum physics.
Erwin Schrödinger
This model features an electron cloud where the electrons move around the nucleus in fast and random directions.
The modern model
He created the first atomic theory.
John Dalton
Negatively charged particles found scattered around the outer part of an atom.
Electrons
Electrons orbit the nucleus at certain distances and can jump from level to level, though not in the space between.
Niels Bohr’s theory
How much of an atom is made of empty space?
99% of the atom.