Atomic Mass Flashcards
1
Q
Democritus
A
hypothesis matter is made of particles called atoms
2
Q
Alchemists
A
- Search for “ elixir of life” (immortality)
- Created lab, glassware and equipment, safe chemical handling procedures
3
Q
John Dalton
A
Created basic particle theory
4
Q
Dimitri Mendeleev
A
invented the modern periodic table
5
Q
J.J. Thomson
A
- proposed electrons were embedded in a valence electron sphere known as a nucleus
- Discovered the electron using a cathode ray tube
6
Q
Ernest Rutherford
A
Proposed each atom contains a dense positive nucleus, composed of protons
7
Q
James Chadwick
A
Discovered the neutron
8
Q
Niels Bohr
A
- studied properties of hydrogen
- proposed electrons orbit, nucleus in distinct paths and levels
9
Q
Heisenberg
A
Created the quantum model
10
Q
Planetary Model
A
- when applied electricity to gas discovered that the gas formed a spectrum of colours
- movement between different levels produce different colours of light
11
Q
Raisin Bun Model
A
- made by J.J. Thomson
- discovered electrons
12
Q
Quantum model
A
Electrons are in 3-D orbitals with different shapes based on probability
13
Q
Gold foil experiment
A
- made by Ernest Rutherford
- shot valence electron particles at a thin sheet of gold foil; some particles went straight through while others were curved
14
Q
Bohr- Rutherford model
A
- electrons orbit, nucleus, and defined energy levels
- Useful for first 20 elements
- 2 electrons in first orbit, 8 in second, 18 in third
15
Q
A
