The Periodic Table. Types of Elements  Metals - Shiny, good conductors, malleable  Nonmetals - Dull, brittle, poor conductors  Metalloids - semi- metals.

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Presentation transcript:

The Periodic Table

Types of Elements  Metals - Shiny, good conductors, malleable  Nonmetals - Dull, brittle, poor conductors  Metalloids - semi- metals

Atomic Radius Increases going down a group Decreases across a period from left to right

First Ionization Energy & Electronegativity Decreases going down a group Increases across a period from left to right

Electron Config. Rules  Aufbau Principle - e- added to the lowest energy level first  Pauli Exclusion Principle 2 e- per orbital  Hund’s Rule - e- spread out into empty sublevels before pairing up

Development of the Atomic Model  Dalton  Thomson  Rutherford  Bohr  Quantum-Mechanical Model

Subatomic Particles  Proton = to atomic # ; positive  Neutron = to mass # - atomic # ; same mass as a proton, but neutral  Electron = atomic # in a neutral atom negative, Carbon - 14 How many p, n, e? Al 3+ How many p, n, e?

Isotopes Elements with the same number of protons, but a different number of neutrons. CC C