Structure of the Atom Describe the structure and arrangement of atomic particles. Characterize and classify elements based on their atomic structure.

Protons, Neutrons, Electrons In the nucleus Positively charged 1.674 x 10-27kg Neutrons No charge 1.675 x 10-27kg Electrons Around the nucleus Negative charge 9.11 x 10-31kg

Atomic Number and Mass Number Equals the number of protons Different elements have different atomic numbers Neutral atoms Same number of protons and electrons Mass Number Atomic number plus the number of neutrons Atomic Mass Actual mass of the element

Isotopes Same atomic number but different mass number i.e. different amount of neutrons Same number of electrons

Atomic Number Practice Number of protons Number of neutrons Number of electrons

Atomic Orbitals Orbital Electron Configuration Ground State Where an electron most likely will be found Electron Configuration Arrangement of electrons in an atom Ground State Lowest possible energy

Orbital Practice http://www.animatedscience.co.uk/flv/