# The Quantum Mechanical Model

## Presentation on theme: "The Quantum Mechanical Model"— Presentation transcript:

The Quantum Mechanical Model
Energy is quantized. It comes in chunks. A quanta is the amount of energy needed to move from one energy level to another. Since the energy of an atom is never “in between” there must be a quantum leap in energy. Erwin Schrodinger derived an equation that described the energy and position of the electrons in an atom

The Quantum Mechanical Model
The quantum mechanical model is a mathematical solution It is not like anything you can see.

The Quantum Mechanical Model
Has energy levels for electrons. Orbits are not circular. It can only tell us the probability of finding an electron a certain distance from the nucleus.

QM model - Modern View The atom is mostly empty space Two regions
1. Nucleus- protons and neutrons 2. Electron cloud- region where you might find an electron

Other particles Proton - positively charged pieces 1840 times heavier than the electron – by E. Goldstein Neutron - no charge but the same mass as a proton – by J. Chadwick

Subatomic particles Relative mass Actual mass (g) Name Symbol Charge
Electron e- -1 1 9.11 x 10-28 Proton p+ +1 1840 1.67 x 10-24 Neutron n0 1840 1.67 x 10-24

Size of an atom Nucleus tiny compared to atom
If the atom was the size of a football stadium, the nucleus would be the size of a marble.