Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

 Choose One Interactives Home Math Interactives -Geometry 3D Shapes -Math in Daily Life -Metric Conversions -Statistics Language Interactives -Elements of a Story -Historical and Cultural -Literature -Spelling Bee Arts -Cinema History Interactives -Collapse -Middle Ages -Renaissance -U.S. History Map Science Interactives -Amusement Park Physics -DNA -Dynamic Earth -Ecology Lab -Garbage -Periodic Table -Rock Cycle -Volcanoes -Weather

# Atomic Basics :

## Atomic Structure

 Chapter Pages ------------- 1 - In the Beginning 2 - The Atom 3 - Atomic Structure 4 - Periodicity 5 - The Periodic Table Activity: Name that Atom Tool: Interactive Periodic Table
 The basics of atomic structure are as follows: Protons are positively charged particles, weighing 1 atomic mass unit (1.67x10-24 grams) and located in the nucleus. Neutrons are neutrally charged particles, weighing approximately 1 atomic mass unit and located in the nucleus. Electrons are negatively charged particles weighing zero atomic mass units and located in the various orbitals of the energy levels outside the atomic nucleus. The electron actually weighs 9.11x10-28 grams. This means it would take about 1,830 electrons to equal the mass of one proton. Since the heaviest naturally occurring element has only 92 electrons in its normal state, we do not count the mass of the electrons in calculating the mass of the atom. So an atom is composed of protons, neutrons, and electrons, but what makes an atom of one element different from the atoms of every other element? The answer starts with something called Periodicity. Almost all of the weight of an atom comes from the protons and neutrons.
 Next: Periodicity