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Gallium is the thirty first element on the periodic table, giving it thirty one protons and electrons. It cannot be found as a free element and is one of the few metals that is a liquid near room temperature (gallium has a melting temperature of 29.8 °C or 85.6 °F).
On the periodic table, it is often classified as a post transition metal. These metals are generally soft, with poor mechanical strength and low melting points. Metals typically have good thermal and electrical conductivity and usually form cations rather than anions.
Gallium is a soft, silvery and brittle metal that is easily alloyed with many metals. It is a highly anisotropic element with two stable isotopes.
Many alloys of gold are often named by they way they change gold’s coloring, such as rose gold or white gold. This additions can be made to alter the properties - as gold is a rather soft and malleable metal - and often is done so for aesthetic reasons. Most forms of colored gold are used in jewelry or decorative items, with a few exceptions.
As gold is one of the few metals that exhibits color (along with copper), additions of other elements to gold can alter the structure ever so slightly in a way that alters the light reflected.
Colored gold alloys tend to fall into three main categories: those within the Au-Ag-Cu system (such as in the phase diagram depicted above); intermetallic compounds, and surface oxide layers. Perhaps the most common and well known varieties of colored gold include white gold and rose gold, but there are many others, including red, pink, green, blue, purple, and black:
Black leather chitons (Katharina tunicata) can grow up to 12 centimetres (5 inches) and will slowly graze on algae, sponges and other sea life. The more you know. 📷: glumshoe/Tumblr #science #chiton #coast #ball #sciencealert http://ift.tt/2vv6I86
By Vietz, Ferdinand Bernhard, 1772-1815 Albrecht, Ignatz.
Publication info Vienna: edited by Ignatz Albrecht and moved bey Phil Jos. Schalbaecher …, [1800] -1822. BHL Collections: Missouri Botanical Garden’s Materia Medica
How often can you say a book has it all? Well this 1635 edition of The Mysteries of Nature and Art by John Bate does. This tiny book packs a real punch with topics ranging from fireworks to drawing. It even has a section on do at home experiments to wow your friends and family.
What I love best about this book is the illustrations. Some of them are both baffling and entertaining. I have no idea why one would want to make a device where a figure of man would stand on a ball and sound a trumpet or why a skeleton is painting a wall while standing in a tank being filled with water but it must make sense to someone. Maybe that someone is you! If it is you, then can you explain what that man is doing to that poor dragon.
