Abundance Occurrence and distribution of rare earths are not only of interest because of their usefulness for industry but also because they have raised a discussion whether rare earths might be essential for plants, animals and even humans. The most plentiful rare earth element, cerium, occur more often in the earth’s crust than lead, molybdenum or arsenic. Lanthanum and neodymium occur in similar quantities as lead. But even thulium, the rarest of the rare earth elements, can be found more often than gold, platinum or iodine. On this fate, REEs are not “rare” at all.
The melting point of the product from the bromination of aniline was 119.8-121.90c, which is in the range of the melting point of 2,4,6-tribromoaniline, 120-1220c, as indicated on PubChem, Open Chemistry Database (pubchem.ncbi.nlm.nih.gov). This verified the formation of the major products. Overall, one can say that the experiment was
Rare earth elements The rare earth elements or REEs consist of the 15 lanthanides plus scandium and yttrium. The last two are also considered REEs because they are found in the same ore deposits and they have similar properties. They are divided into 2 groups: the light rare earth elements (LREEs), with lanthanum, cerium, praseodymium, neodymium, promethium and samarium, and the heavy rare earth elements (HREEs), with yttrium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. Although Yttrium normally would fall under the LREEs, it is a HREE because of the similar properties with the other HREEs. All REEs can be seen on the periodic table in Figure 1.
According to Chemicool.com, “An element is a substance consisting of atoms which all have the same number of protons, they are the simplest substances that cannot be broken down.” I will be focusing on an element called platinum. Platinum is considered to be one of the most valuable metals in the world. Platinum was 1st discovered in a tomb in an Egyptian tomb in 7th century BC, but this metal went under the radar until 1557, when an Italian scholar known as Julius Scaliger wrote about a metal located in South America that would not melt, which is now known as platinum. In 1735, Antonio Ulloa found platinum again, but he was captured by the royal navy and ended up in London. The royalty there was very interested in platinum, and by 1750 people were talking about platinum.
Introduction This book report discusses the book which is called “Rare Earth: Why Complex Life is Uncommon in the Universe”, and written by Peter D. Ward and Donald Brownlee. The designated book is in the paperback edition published by Copernicus Books in New York in 2003. There are thirteen chapters in total. “Rare Earth: Why Complex Life is Uncommon in the Universe” is a book introducing and discussing the “Rare Earth Hypothesis”. The “Rare Earth hypothesis” argues that the occurrence and development of those complex multi-cellular lives including highly intelligent human beings on the earth, require an extremely uncommon combination of, diverse geological, biological, chemical, meteorological and astrophysical factors, events and circumstances.
Gold is a metal whose atomic weight is 79 and its standard atomic weight is approximately 197 gr/mol. It has a yellow colour when in bulk, though when finely divided it may be red, black, purple or blue. In the bulk form gold is a soft yellow metal, which has a face centred cubic crystal structure. Gold as a bulk material is known for thousands of years (before 3000 BC) and generally is extracted from mines. It has been used generally in decoration and jewellery from ancient times .
This molecule possess C_21 H_22 O_5 and 354.40 of molecular formula and molecular weight respectively. Furthermore, this compound has the density 1.244 which conveys that it is denser than water. As comparison, It’s melting point range from 157℃ up until
5.1 Iron according to Science Field Iron in the chemistry can be refer to FE in periodic table. It can be found anywhere. You can find it in the water, or in the universe and even in our body have the iron element. But not all of the iron are same. In the universe, there are many of the iron element can be found there.