Mahjong Chem -- Free Game to Practice Chemistry Knowledge! Also available for your iPhone/iPad/iPod here or Android device here. Brought to you by the Chemistry Department at Stetson University. The entire content of this web site is copyrighted by Stetson University under the copyright laws of the United States (Title 17, U.S. Code). You are welcome to repost for educational purposes.
NSTA Learning Center. Details Description Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the second of three Science Objects in the Atomic Structure SciPack. It explores the structure-related properties that make one type of atom different from another, and looks more closely at the role of the neutron.
The number of protons in the nucleus determines what an atom's electron configuration can be and so defines the element and its properties. An atom's electron configuration, particularly the outermost electrons, determines how the atom can interact with other atoms. Although neutrons have little effect on how an atom interacts with others, they do affect the mass and stability of the nucleus. Additional Info Technical National Standards Correlation. Halflife. The applet lists a "halflife" for each radioactive isotope. What does that mean? The halflife is the amount of time it takes for half of the atoms in a sample to decay.
The halflife for a given isotope is always the same ; it doesn't depend on how many atoms you have or on how long they've been sitting around. For example, the applet will tell you that the halflife of beryllium 11 is 13.81 seconds. Hmmm...so a lot of decays happen really fast when there are lots of atoms, and then things slow down when there aren't so many.
That's exactly right. Notice how the decays are fast and furious at the beginning and slow down over time; you can see this both from the color changes in the top window and from the graph. You'll also notice that the pattern of atoms in the top picture is random-looking, and different each time you run the applet, but the graph below always has the same shape. What is a mole? | The Chemistry Journey | The Virtual School. Home. Common Compound Library A searchable database of over 800 common compound names, formulas, structures, and properties. Companion Notes Hyperlinked notes and guides for first semester general chemistry. Construction Kits Flash-based kits for building chemical formulas, names, equations, and problem solutions. Articles Featured articles, books, and tutorials. Toolbox Interactive graphing, popup tables, and calculators. Tutorials Index of self-guided tutorials, quizzes, and drills on specific topics.
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