Hank tells us about the awesomeness of the periodic table and the genius of the man who invented it.

In this video Paul Andersen explains how atoms are conserved in a chemical reaction. This can be seen in a chemical equation where the subscripts represent the atoms in the molecule and the coefficients represent the molecules. The...

Hank introduces us to the man behind the periodic table - the brilliant Russian chemist Dmitri Mendeleev.

In this video Paul Andersen explains how a spectrometer was used to identify the presence of isotopes. This modified Dalton's original atomic theory because atoms of the same element had different masses. The functional parts of a mass...

Hank tells us about the awesomeness of the periodic table and the genius of the man who invented it.

The elements had been listed and carefully arranged before Dmitri Mendeleev. They had even been organized by similar properties before. So why is Mendeelev's periodic table the one that has endured? Lou Serico explains via Ekaaluminium,...

Recently, humanity filled the periodic table up to atomic number 118, which nicely rounds out that row. But are we done yet? Have we discovered all of the different elements? And what is an "island of stability?"

Hank gives us a tour of the most important table ever, including the life story of the obsessive man who championed it, Dmitri Mendeleev. The periodic table of elements is a concise, information-dense catalog of all of the...

The mass of the sun was well understood, and translates to about 10^57 atoms. This leads to a lifetime of the sun of about 20,000 years. But we know the sun is at least 4.5 billion years old. So where does the...

The molar mass of a chemical compound is the mass, in grams, of 1 mole of the substance.

The periodic table is arranged by atomic number, which is the number of protons in an element’s nucleus. The elements are arranged in order of increasing atomic number. The periodic table is also arranged by groups and periods. The...

The average mass of atoms of an element.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce...

In 1869, Russian scientist Dmitri Mendeleev created the Periodic Table, ordering the naturally occurring elements by their structure and properties. His Periodic Table changed the course of Chemistry forever, and even predicted the...

When Mendeleev created the Periodic Table in 1869, he also predicted the existence of elements yet to be discovered, including gallium. What are the properties of this rare metal and why was its discovery so important? Chemistry -...

The story of chemist John Newlands and his theory of the "Law of Octaves" that related chemical elements to notes in the musical scale. Did the scientific community accept his unusual theory and does it hold up to the laws of modern...

The periodic table is arranged by atomic number, which is the number of protons in an element’s nucleus. The elements are arranged in order of increasing atomic number. The periodic table is also arranged by groups and periods. The...

Learn about the Actinide Metals in the periodic table with this fun educational music video and parents. Brought to you by KLT. Don't forget to sing along.

Neutrons and Isotopes describes how neutron loss or gain affects the stability of an atom by using terms such as isotope, atomic mass, unstable, and decay.

This video will explain the concept of a mole and how to calculate the molarity of a solution using concentration of solutions.

The Periodic Table: Atomic Number examines the Periodic Table of Elements and uses the atomic number to identify the number of protons, neutrons, and electrons in a given element.

The video discusses the history of the periodic table and how it was developed by various scientists over many years. It explains how atomic weights were initially used to organize the elements before the discovery of atomic number. It...

Learn the basics about Atomic Mass Units. The atomic mass is used to find the average mass of elements and molecules and to solve stoichiometry problems. Find out more in this video!

This video provides a historical account of how the periodic table was developed. The video highlights the challenges faced by chemists during the 19th century in trying to order the newly discovered elements due to a lack of knowledge...

How did scientists make sense of the characteristics of elements? What is the periodic table? How are elements classified? What are the major categories of elements? What are exceptions regarding the periodic table?

Periodic Table...