chem regents study guide

chem

Dalton’s Model:

Elements are made of atoms  Atoms of an element are the same.  Compounds are formed from combinations of atoms.

Rutherford Experiment

Bombarded gold foil with alpha particles. Showed atoms were mostly empty space with small, dense positively charged nucleus.

Bohr Model

Small, dense, positively charged nucleus surrounded by electrons in circular orbits

Wave-Mechanical Model (Modern Atomic Theory

Small, dense, nucleus positively charged nucleus surrounded by electrons moving in “electron cloud”.  “Orbitals” are areas where an electron with a certain amount of energy is most likely to be found.