Bell ringer

• Right out the electron configuration forPotassium

Phosphorus

• Light – 1-electromagnetic radiation to which the organs

of sight react, ranging in wavelength from about 400 to 700 nm

A man named Plank

• Max Planck a German physicist• Proposed that electrons can only gain or

release energy in discrete intervals • This interval is know as plank’s constant• h=6.626x10-34 joule-seconds• E=hν, therefore energy increase by intervals– Example-stairs

Planks constant explains how electrons have energy levels

Interactive programs

• http://www.visionlearning.com/library/flash_viewer.php?oid=1347&mid=51

• http://www.bigs.de/en/shop/anim/termsch01.swf

Example Electron Configuration

• F-atomic number is 9 – Ground state 2-7 excited state 2-6-1

• Cu-atomic number is 29– Ground state 2-8-18-1 excited state 2-8-17-2

• Te-atomic number is 52– Ground state 2-8-18-18-6 excited state 2-8-18-17-7

• Sr-atomic number is 38– Ground state 2-8-18-8-2 excited state 2-8-18-7-3

Mixture

More then one element

• What is the excited electron configuration of Sulfur?

- 2-7-7 or 2-7-6-1

• What is h?-Plank’s constant (6.626x10-34 Js)

• When does an electron release energy?-When it falls from an excited

state

• Which series produces visible light?- Balmer-series