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Honors Chemistry Atomic Structure Test

Terms in this set (15)

Sodium/Na (flame color)
orange
Calcium/Ca (flame color)
orange
Barium/Ba (flame color)
yellow green
Lithium/Li (flame color)
hot pink
Potassium/K (flame color)
purple
Strontium/Sr (flame color)
red
Copper/Cu (flame color)
blue green
1. All matter is composed of small particles call atoms
2. All atoms of a given element are identical
3. Atoms can't be created or destroyed
4. Atoms combine in simple, whole number ratios to form compounds.
5. Conservation of matter
Dalton's five principles
Experiment: cathode ray tube
- Electricity is passed through a glass tube
- The gabs can be bent with a magnet
Whose experiment?
J.J. Thompson
Discoveries:
- Atoms consist of charged particles
- Negatively charged particles are called electrons
- Positively charged particles are called protons
Whose discoveries?
J.J. Thompson
Plum Pudding
J.J. Thompson
Experiment: Gold foil experiment
- Positively charged alpha particles shot at a piece of gold foil
- Some particles were deflected
Whose experiment?
Ernest Rutherford
Discoveries:
- An atom has a positively charged core
- The core is called the nucleus
- Electrons surround the nucleus
- The rest of the atom is empty space
Whose discoveries?
Ernest Rutherford
Discoveries:
- The neutron
- It has no charge
- Found in nucleus
Chadwick
Problem: According to physics, atoms should collapse
Experiment: Light spectrums
Discoveries:
- Electrons can only be found in energy levels
- Each energy level contains a certain amount of energy
- Lower levels (closer to the nucleus) have less energy
- Higher levels (farther from nucleus) have more
👏Who did this 😂
Bohr
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