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Chemistry

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Applet: Electron Configurations. Chemistry is EASY! How do you write electron configurations? Electrons. After reading this section you will be able to do the following: Describe the behavior of electrons in an atom.

Electrons

Explain how electrons allow atoms to gain or lose energy. So far, we have talked mainly about what is inside the nucleus of an atom. Protons and neutrons are found in the nucleus. Circling around outside the nucleus are tiny little particles called electrons. According to current theory, electrons are arranged in energy levels around the nucleus. The photon shown in the graphic can be considered a small bundle of energy (For more information on atoms, you may want to review the materials on magnetism.) Review: Protons - Science for Kids! Atoms: Neutrons. Neutrons are the particles in an atom that have a neutral charge.

Atoms: Neutrons

They aren't positive like protons. They aren't negative like electrons. But don't start thinking that they aren't important. Every piece of an atom has huge importance to the way the atom acts and behaves. Neutrons are no exception. So, if an atom has equal numbers of electrons and protons, the charges cancel each other out and the atom has a neutral charge. You know that neutrons are found in the nucleus of an atom. Or search the sites for a specific topic. A simple view of atomic structure.

The nucleus The nucleus is at the centre of the atom and contains the protons and neutrons.

a simple view of atomic structure

Protons and neutrons are collectively known as nucleons. Virtually all the mass of the atom is concentrated in the nucleus, because the electrons weigh so little. KS3 Bitesize: Science - Chemical and material behaviour. Classic ChemBalancer - Welcome. This is the classic version of Chembalancer that teaches you how to balance equations for the first time.

Classic ChemBalancer - Welcome

To play it, just press the "Start Game" button above. To play the other versions, click here. Schools Science Clips - Solids and liquids. Lewis Structures. Lewis Structures Writing Lewis Structures by Trial and Error The Lewis structure of a compound can be generated by trial and error. We start by writing symbols that contain the correct number of valence electrons for the atoms in the molecule. We then combine electrons to form covalent bonds until we come up with a Lewis structure in which all of the elements (with the exception of the hydrogen atoms) have an octet of valence electrons. Example: Let's apply the trial and error approach to generating the Lewis structure of carbon dioxide, CO2. Lewis Dot Structure Tutorials.

Chemistry. ChemThink. Flash Animations. Build an Atom. The Sun related to the solar system & galaxy. Chmistry Links. The Particle Adventure. Periodic Table. Explore learning homepage. Chemical Reactions. Chemical element games - periodic table info. Level Chemistry Revision.

Molecular Workbench - Database. Molecular Workbench offers interactive, visual simulations and activities that have been widely used in science teaching for students of all ages.

Molecular Workbench - Database

Our database is designed to provide teachers and students with easy access to our model-based activities. The activities are derived largely, but not entirely, from projects of the Concord Consortium sponsored by the National Science Foundation (NSF). The models are primarily of interactions of atoms and molecules, or rule-based genetics.

All activities are accompanied by: colored icons to indicate degree of support technological requirements links to concepts and disciplines links to standards links to some textbooks Activities can be accessed by typing an activity number in the field Jump to Activity at top right. Note: This database is in development.

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