Understanding Atomic Theories

Front

First to propose the idea of atoms as indivisible particles

Back

Democritus' Contribution

Front

Atoms are indivisible, identical in an element, and combine in whole-number ratios

Back

John Dalton's Atomic Theory

Front

Plum Pudding Model

Back

Thomson's model with electrons in a positive "soup"

Front

Dense nucleus with electrons orbiting around it

Back

Rutherford's Atomic Model

Front

Electrons in fixed orbits with quantized energy levels

Back

Niels Bohr's Model

Front

Distribution of electrons in an atom's orbitals

Back

Electron Configuration

Front

Electrons in the outermost shell, important for chemical bonding

Back

Valence Electrons