Watch alpha particles escape from a polonium nucleus, causing radioactive alpha decay. See how random decay times relate to the half life.
In this interactive activity from ChemThink, take a closer look at atomic structure, properties, and behaviors.
Explore the origin of energy bands in crystals of atoms. The structure of these bands determines how materials conduct electricity.
Explore the origin of energy bands in crystals of atoms. The structure of these bands determines how materials conduct electricity.
Watch beta decay occur for a collection of nuclei or for an individual nucleus.
Watch beta decay occur for a collection of nuclei or for an individual nucleus.
Students gather evidence about the contents of a sealed container and make predictions about the contents. Provides a good introduction to how scientists have determined the composition of atoms.
This activity also works well to discuss the nature of science in developing hypotheses, various ways of collecting data, and drawing supported conclusions.
Depicts millions of aluminum atoms. An atom is the smallest part of an element that still has all the properties of that element.
An atom is the smallest part of an element that still has all the properties of that element. Each different element is made up of a different kind of atom.
CK-12 Physical Science Concepts covers the study of physical science for middle school students. The 5 chapters provide an introduction to physical science, matter, states of matter, chemical interactions and bonds, chemical reactions, motion and forces, and the types and characteristics of energy.
Chemistry: Atoms First is a peer-reviewed, openly licensed introductory textbook produced through a collaborative publishing partnership between OpenStax and the University of Connecticut and UConn Undergraduate Student Government Association.
This title is an adaptation of the OpenStax Chemistry text and covers scope and sequence requirements of the two-semester general chemistry course. Reordered to fit an atoms first approach, this title introduces atomic and molecular structure much earlier than the traditional approach, delaying the introduction of more abstract material so students have time to acclimate to the study of chemistry. Chemistry: Atoms First also provides a basis for understanding the application of quantitative principles to the chemistry that underlies the entire course.
This interactive activity from ChemThink takes a closer look at a covalent bond--how it is formed and how the sharing of two electrons can keep atoms together.
The Atomic Theory proposed that all elements are made of atoms. It stated that all atoms are indivisible and cannot be destroyed.
This highly visual model demonstrates the atomic theory of matter which states that a gas is made up of tiny particles of atoms that are in constant motion, smashing into each other. Balls, representing molecules, move within a cage container to simulate this phenomenon. A hair dryer provides the heat to simulate the heating and cooling of gas: the faster the balls are moving, the hotter the gas. Learners observe how the balls move at a slower rate at lower "temperatures."
Create a laser by pumping the chamber with a photon beam. Manage the energy states of the laser's atoms to control its output.
Create a laser by pumping the chamber with a photon beam. Manage the energy states of the laser's atoms to control its output.
How did scientists figure out the structure of atoms without looking at them? Try out different models by shooting light at the atom. Check how the prediction of the model matches the experimental results.
Explore molecule shapes by building molecules in 3D! Find out how a molecule's shape changes as you add atoms to a molecule.
The charge of particles plays an important role in how they react with one another.
Produce light by bombarding atoms with electrons. See how the characteristic spectra of different elements are produced, and configure your own element's energy states to produce light of different colors.