This online resource is for information on the 16th element of the Periodic Table--Sulfur--can be found here. The site lists scientific information such as atomic weight, atomic number, melting/boiling point, and more. There is also a...

Learn about the classification of matter based on whether the chemical composition is pure or a mixture. Understand the definitions of elements, compounds, substances, and mixtures, and what the differences are between them. Five types...

Chemical composition is a section of a larger overview on Chemistry, covering a variety of aspects. This section focuses on elements, atoms, compounds, and structure. Examples, formulas, and pictures are provided.

This colorful page goes over the proper techniques for writing Lewis structures for elements. This is a great place to begin learning how to write Lewis structures. When you are ready for a more advanced lesson, follow the link to learn...

Students learn about the periodic table and how pervasive the elements are in our daily lives. After reviewing the table organization and facts about the first 20 elements, they play an element identification game. They also learn that...

This section from the online textbook, "An Introduction to Chemistry", gives the steps to calculate the percent of an element in a compound. A few example calculations are shown. Also find links to chapter maps and power points for other...

Resource contains and example problem and solution of how to compute percent compound within a mixture when given the mixture's mass and element percents.

Covering a range of eight topics related to chemistry, this resource provides a wealth of information complete with pictures, charts, graphs, and examples. Includes information on elements, compounds, atoms, molecules, structures,...

As part of the "Basic Atomics" section of the Virtual Textbook, this site examines basic chemical nomenclature and covers a variety of subjects related to chemical substances. Other topic covered include naming the elements, binary...

In this activity, students construct models of molecules using marshmallows and gum drops.

The element lead is a neurotoxin that is particularly dangerous to young children. Among other uses, lead compounds were common paint additives until being phased out for safer titanium-based additives beginning in the 1960's. Lead...

Information about the element, Calcium, atomic number 20. Covers physical and atomic properties, sources, its role in geochemical cycles, how abundant it is on the Earth, its isotopes, some compounds of calcium, and its importance to...

The ways in which an element or compound such as water moves between its various living and nonliving forms and locations in the biosphere is called a biogeochemical cycle. All of the atoms that are building blocks of living things are a...

This entry focuses on the rules for comma use including listing the uses, explaining the rules, and providing detailed examples.