4-5 & 4-6

4-5 - finish notes on radiation (see previous post) and practice with what happens in alpha and beta decay.

Get tests back (most classes)

Homework: Worksheet on decay / radioactivity

4-6 Today in class: Half Life Simulation - pennies!

determination of number of half lives to get a substance to turn from parent to daughter nuclei. Just because a half life has passed for a particular element does not mean that exactly half of its nuclei will have decayed. Statistically half should.

Today's warm-up: In Beta Decay: Atomic number _______. Atomic Mass ____________. __________ is ejected from the nucleus. (_________ is emitted as well!)

Answers: Increases by 1, remains the same, Beta particle / electron , gamma ray

Tonight's homework: Read p. 791-799

Tomorrow: problems & practice with decay series and half lives / dating Start talking about biology and radiation