Science PT3

the process through which a substance changes from a liquid to a solid. All liquids except helium undergo freezing when the temperature becomes sufficiently cold. 

Has definite volume

• LIQUID

• SOLID

• GAS

• PLASMA

Billiard Ball Model

• Joseph John Thomson ( J.J. Thomson)

• Ernest Rutherford

• 
  

   Aristotle

  
  

• John Dalton

• The existence of the third subatomic particle was discovered through his experiments on Beryllium known as Neutrons. 

is a more massive (but still tiny) subatomic particle with a positive charge, represented as p+.

• Electron

• Proton

• Nuetron

• Nucleus

The sum of the number of protons and neutrons in the nucleus

• Number of Electrons

• Mass number

• Atomic number

• Number of Protons

• The ( ) of an element describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atoms are placed in a sequence.

• Named after the German word Aufbeen which means ‘build up’

• States that the electrons will occupy the orbitals having lower

• Pauli Exclusion principle

• Aufbau Principle

• Hund’s Rule

States that a maximum of two electrons can fit in one orbital, each having opposite spins.

• Aufbau Principle

• Hund’s Rule

•  Pauli Exclusion principle