CHEMISTRY

• parts of an atom :

  1. Proton (+)
  2. Electron (-)
  3. Neutron
• Ernest rutherford

  
• Niel Bohr suggested that electrons orbit the nucleus in shells.
• ernest rutherford discovered the nucleus of an atom is positively charged and the electrons orbit the nucleus in shells
• Niel Bohr

  
• quantum model

  
• P = E = Atomic number
• atomic number - atomic mass = neutron
• ionic bonding - involving a transfer of electron from one atom/molecule to another
• in ionic bonding, the positive charge is called a cation
• in ionic bonding, the negative charge is called anion
• Ionic bonding : nm + m
• covalent bonding - sharing of electrons that contains carbon
• electron has no weight
• covalent bonding : nm + nm
• in covalent bonding, the positive charge loses electrons
• in covalent bonding, the negative charge is gaining electron
• solid to liquid - melting
• solid to gas - sublimation
• liquid to solid - freezing
• liquid to gas - evaporation
• gas to solid - deposition
• gas to liquid - condensation
• Plasma to gas - recombination
• gas to plasma - ionization