The reactivity of an element is a function of how easily an element loses or gains electrons. To determine an element's reactivity, we can learn a lot from the periodic table, and its particular trends. The first element in the halogen...

Why does chemistry happen?? Why do ions form?? Why do elements bond together?? These are all important questions and the answer comes back to one very important principle in chemistry and that is element stability. Elements are stable...

Unreactive, and resistant to change by any chemical means. 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...

The tendency of a substance to undergo chemical reactions. 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...

A mixture containing a metal element, made by melting the different elements together. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...

While most elements can easily be categorised as either metals or non-metals, a few have physical and chemical properties that are in between, which makes them harder to classify. A Twig Science Glossary Film. Key scientific terms...

A massive ball of extremely hot gases, held together by its own gravity. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...

A formula that shows the actual numbers of atoms of each element in one molecule of a compound. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig...

Elements in group 8, also called group 0, of the periodic table. 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...

The process of deriving metals from their naturally-occurring ores. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...

The elements in the middle and left side of the Periodic Table are all metals. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary...

The number of protons in the nucleus of an atom. 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 abstract concepts...

The study of carbon-based compounds. 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 abstract concepts and key...

Definitions and examples of three distinct chemical classifications: elements, compounds and mixtures. Chemistry - Atoms And Bonding - Learning Points. A Twig FactPack Film. Open a discussion on what has been already learnt in a topic,...

Discover the unique properties of silicon, which is found in many things from sand to computers. Chemistry - Periodic Table - Learning Points. Silicon is a metalloid element. Silicon is found in sand, quartz, the Sun and stars. Silicon...

Revealing the elements which make up the human body, and their relative abundance. Chemistry - Periodic Table - Learning Points. A Twig FactPack Film. Open a discussion on what has been already learnt in a topic, or use to grab attention...

Mercury is an elusive and toxic element. Chemistry - Periodic Table - Learning Points. Mercury is a rare element. Mercury is a liquid at room temperature. Mercury is highly toxic. Mercury is used in thermometers and batteries. A Twig...

The emission of particles as a result of the spontaneous decay of atomic nuclei. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary...

A small, extremely dense star characterised by high temperature and luminosity, no longer capable of nuclear fusion. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...

A substance composed of more than one chemical element, whose atoms are held together by strong chemical bonds and are combined in a fixed ratio. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using...

A systematic arrangement of the chemical elements. 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 abstract...

A unique combination of sunspots, solar flares and magnetic fields combine to create a visual spectacle on Earth. But what are the forces at work? Physics - Our Solar System - Learning Points. Natural light displays known as Aurora...

The story of New Zealand scientist Ernest Rutherford, who revolutionised science by discovering the structure of the atom in 1908. Chemistry - Atoms And Bonding - Learning Points. In 1908, Ernest Rutherford conducted the gold leaf...

Discover the specific conditions needed for the formation of emeralds, rubies and sapphires; and how there is now potential to 'grow' them in laboratories. Earth Science - Geology - Learning Points. Emeralds are made from beryllium....