Atomic Theory Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Leucippus and his student Democritus

A
  • Year: around 440 BCE
  • They first proposed that everything was many of of tiny particles surrounded by empty space
  • “Blind guess”

Very very old and greek

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

John Dalton

A
  • Year: 1808
  • English
  • Proposed an indivisible particle (the atom)
  • Concept of atomic theory
  • Atomic model

Original, old

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Joseph John Thompson

A
  • Year: 1897
  • English
  • Discovered electrons
  • Said the atom was a sphere of positive charge embedded with negative electrons (a combination of smaller + and - particles)
  • Determined this by the Cathode Ray Tube experiment
  • “Plum-pudding model”

Eureka moment, optimist but pretends to be a pessimist, likes worms and pudding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Ernest Rutherford

A
  • Year: 1911
  • New Zealander
  • Every atom has a positively charged nucleus
  • Discovered with the gold foil experiment
  • Mass is mostly contained in the nucleus
  • Thompson’s student
  • “Nuclear model”

Happy, rich, strong

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Neils Henrik David Bohr

A
  • Year: 1913
  • Danish
  • Discovered the shells surrounding the nucleus where electrons are at large
  • Nobel prize winner
  • Created the current simple model of an atom
  • Electrons are paired and arranged, however they can jump between shells by gaining or losing electrons.
  • Also Thompson’s student
  • “Planetary model”

Smart, big, bi-polar, yummy cheese

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Werner Heisenberg

A
  • Year: 1926
  • German
  • Formulated the “uncertainty principle” (“wave equation”)
  • Discovered that it is impossible to determine the exact speed and position of electrons as they move around an atom

Friends with Schrodinger, he’s a snake, lazy, uncertain principal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Erwin Schrödinger

A
  • Year: 1926
  • Austrian-Irish
  • Described hydrogen atoms as clouds of negative charge
  • Electrons move around the nucleus in a cloud, not in orbits
  • The closer to the nucleus, the higher chance there will be electrons
  • Came up with the “Quantum-Mechanical Model”

Multicultural, likes Ant-Man, stormy, doesn’t like circles, likes to be close to people

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

James Chadwick

A
  • Year: 1932
  • English
  • Discovered that the nucleus also contains neutrons
  • Rutherford’s student
  • Mass of nucleus is around the mass of protons

Peacemaker/fair, young, expert on neutrals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is atomic theory?

A
  • The study of the nature of atoms and how they combine to form all types of matter
  • Different atoms give elements different properties
How well did you know this?
1
Not at all
2
3
4
5
Perfectly