The elements in Group 7 of the Periodic Table are called the halogens. They include chlorine, bromine and iodine. Learn about their properties and uses, then take a quiz.

Find out how energy level models are represented on the Periodic Table of Elements.

This lesson focuses on the periodic table and the configurations. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic configurations model how electrons are arranged in atoms. A link to...

The number of protons in the atom of an element determines its place in the Periodic Table. The number of electrons in an atom is the same as the number of protons. These electrons are arranged in shells or 'energy levels' around the...

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. Europium is element number 63 on the periodic table. [1:20]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about copper- element number 29 on the periodic table. Discover it with a nice demonstration and some interesting stories from...

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about yttrium. It is found in moon rocks and bullet-proof glass. Come with us to Sweden to discover it.

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about manganese- element number 25 and a metal with a very rich chemistry.

The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about chlorine - element number 17, an extremely reactive and dangerous gas, which was used as a weapon in World War I. [8:41]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about phosphorus, an incredibly flammable element found in certain bombs and your body. [3:49]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about nickel- its element number 28 and a transition metal. [1:39]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about praseodymium, an element used to filter harmful light. Praseodymium has even helped slow light's speed down to a mere 300...

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. In this video, we take a look at cadmium, a highly toxic element used on pots, pipes, and for all kinds of other applications. [1:50]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about the first useful metal on the periodic table, magnesium. It famously burns very brightly when exposed to flame. [6:36]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about antimony, an element commonly used in the electronics industry.

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about element number 16- sulfur. And we can discover it with a cool experiment called "the barking dog." [6:30]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. Element number 115 still has the temporary name ununpentium. [6:35]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about oxygen- it's number 8 and is among the most "famous" of the elements.

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about element number 57. Lanthanum is the first of the rare earth minerals. [1:50]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about zirconium, a key part of a nuclear reactor. [5:53]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. We get a close-up look at neptunium during a visit to the National Nuclear Laboratory at Sellafield. [5:46]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about potassium. In this video, see some violent explosions and the gentle creation of a potassium mirror. [4:32]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about gallium. Discover gallium and be amazed as you watch the experiment called "the beating heart." [7:11]

The team at Periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about aluminium, a metal once as precious as gold, now used for wrapping a sandwich. [11:52]