Chemistry Chapter 2
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Greek for Indivisible
Leucippus and Democritus
First thought of atom in 5th century BC
Law of Conservation of Mass
Matter cannot be created nor destroyed
Law of Definite Proportions
All samples of a given compound, regardless where it came from, have the same proportions of their constituent elements.
Law of Mulitiple Proportions
When two elements form two different compounds, the masses of elemnt B that combine with 1gram of element A can be expressed in small whole number ratios.
Cathode Ray Tube/Cathode Ray/ Electron
Oil drop experiment, determined charge of oil drops.
- Discovered Proton and nucleus
- gold foil experiment
- 1. Nuclues contains 99% of atoms mass
- 2. Atom is mostly empty space
- 3. Atoms have the same number of protons and electrons.
Neutrally charged particles
Define an atom, located in nucleus
Atoms with different numbers of neutrons but same number of protons.
Atomic Mass- Protons
Negatively charged ions
Positively charged ions
Elements arranged in order of atomic mass have recurring properties
Alkaline Earth Metals
- Group 2A
- Reactive elements
- Group 7A
- Very reactive non metals
- Group 8A
- Do NOT form Ions.
- Mostly unreactive
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