C4- Chemical Patterns

C4- Chemical Patterns

1. Atoms

   • The nucleus
     • It's in the middle of the atom
     • It contains protons and neutrons
     • It has a positive charge because of the protons
     • Almost the whole mass of the atom is in the nucleus
     • Its tiny compared to the rest of the atom
   • Electrons
     • Move around the nucleus
     • negatively charged
     • tiny, but covers a lot of space
     • Arranged in shells
   • Number of Protons = Number of Electrons

2. Line Spectrums

   • Some elements emit colours when heated
     • Lithium
     • Sodium
     • Potassium
   • Each element give a characteristic line spectrum
     • 1. When heated electrons release energy as light
     • 2. Wave lengths emitted can be recorded as a line spectrum
     • 3. Different elements emit different line spectrums
     • 4. The practice technique to identify line spectrums is called spectroscopy.
   • Can be used to identify new elements

3. History of The Periodic Table

   • Döbereiner
     • 1800s
     • Put them into groups of three called triads. Based on chemical properties