Curriculum Expectations | Background Information | Common Misconceptions | Lesson Ideas | Teaching ideas and Resources| Assessment | Foundation of Professional Practice | Societal Implications and Applications | Glossary | Creative Piece | References
DALTON’S THEORY
•Matter is made up of indestructible atoms.
• Law of definite proportions: Elements combine in a characteristic ratio
• Law of multiple proportions: Some elements have more than one combining capacity
• Law of conservation of mass:
Atoms cannot be created nor destroyed
• Law of definite proportions: Elements combine in a characteristic ratio
• Law of multiple proportions: Some elements have more than one combining capacity
• Law of conservation of mass:
Atoms cannot be created nor destroyed
THOMSON’S THEORY
- ¨The raisin bun Model": Atoms are solid spheres made-up of a solid positive mass (or core) with tiny negative particles embedded in the positive core.
RUTHERFORD’S THEORY
•Atoms have a tiny nucleus which contains positive & neutral charges and makes up the majority of the mass of the atom
• Electrons are negative and occupy most of the volume of the atom.
• Protons tell us the identity of the element
• Electrons are negative and occupy most of the volume of the atom.
• Protons tell us the identity of the element
ATOMIC STRUCTURE
atomic structure is the the structure of an atom that consist of a positively charged nucleus surrounded and neutralized by negatively charged electrons revolving in orbits at varying distances from the nucleus
LEWIS STRUCTURE
A Lewis Dot Structure is a symbol of description of the valence electrons in a molecule. The dots are used to represent individual electrons and lines represent covalent bonds.