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Elements & Periodic Table

Elements & Periodic Table
Now we're getting to the heart and soul of the way the Universe works. You know that a generic atom has some protons and neutrons in the nucleus and some electrons zipping around in orbitals. When those pieces start combining in specific numbers, you can build atoms with recognizable traits. If you have eight protons, neutrons and electrons, you will have an oxygen (O) atom. Remember that 'atom' is the general term. As far as we know, there are a limited number of basic elements. With the tools you learn here, you can explore and understand the Universe. Since the launch of the site, we've been asked, "Why start with 18?" (1) Electrons fit nicely into three orbitals. As we move past the first eighteen elements, you can start to learn about transition elements in the fourth period (row) of the periodic table. Related:  Internet Resources on the Periodic TableChemistry

WebElements Four New Elements Added To The Periodic Table Enlarge The periodic table of the elements Scientists just filled in a few gaps in the periodic table of elements. Elements with atomic numbers 113, 115, 117, and 118 have been added to the periodic table. The new elements were added after the International Union of Pure and Applied Chemistry (IUPAC) reviewed scientific studies published by teams of researchers in the United States, Japan, and Russia. These elements are among the heaviest in the periodic table and aren’t known to exist outside the lab. These elements, which complete the seventh row of the periodic table, are the first to be added since 2011, when flerovium (element 114) and livermorium (element 116), also superheavy metals, were added. Element 113, which was discovered by Japanese researchers, will become the first element to be named in Asia, according to The Guardian.

Color Changing Milk of Magnesia Place about 100 mL of Milk of Magnesia in a 500 mL beaker and dilute with tap water until the beaker is about half full. Add about 10 mL of Universal Indicator. (The Universal Indicator will provide the sharp color change you see in the video). Remember that Universal Indicator will turn red on the far acidic end of the scale and dark blue on the alkaline side. Milk of magnesia is a liquid used as an antacid and, sometimes, a laxative. Milk of magnesia is an alkaline suspension, meaning that it undergoes a neutralizing reaction when encountering anything acidic. Thanks to Sue Ann Berger, retired chemistry teacher from Bear Creek High School and Andrew Merutka from South High School for the idea for this experiment.

Chemicool: Periodic Table of Elements and Chemistry 4 New Elements Are Added To The Periodic Table An artist's illustration shows element 117, which has now been officially added to the periodic table of the elements. Kwei-Yu Chu/LLNL hide caption toggle caption Kwei-Yu Chu/LLNL An artist's illustration shows element 117, which has now been officially added to the periodic table of the elements. For now, they're known by working names, like ununseptium and ununtrium — two of the four new chemical elements whose discovery has been officially verified. With the discoveries now confirmed, "The 7th period of the periodic table of elements is complete," according to the IUPAC. The elements were discovered in recent years by researchers in Japan, Russia and the United States. Three other elements were discovered by a collaborative effort among the Joint Institute for Nuclear Research in Dubna, Russia, the Lawrence Livermore National Laboratory in California. The new elements' existence was confirmed by further experiments that reproduced them — however briefly.

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What Rare Earths Are Locked in Your Cell Phone? Every time I see a commercial for a new cell phone, I feel a bit nauseous. I love a new cell phone just like the next person, but because of my training as a materials scientist, I feel like a worker in a sausage factory. Cell phones, like sausages, may be great, but you don’t really want to know what it takes to make them. Our lust for new devices isn’t sustainable, at least not yet. Some of the key materials used to make them, mainly rare earth elements, are in tight supply, in part because the primary source of rare earths are mines in one country, China. Headphones rely on magnets, often made of neodymium, to produce lots of sound from a small enclosure. Rare earth elements are peppered throughout your phone, from the glass display, making it harder, to magnets in speakers, headphones, and vibrating motors, making them more powerful despite their small size. But cell phones aren’t the only products affected by the monopoly. Digging Deeper Rare earths are not easy to mine. Sea Change

Carbon Dioxide Can Make a Solution Acidic | Chapter 6: Chemical Change Do a demonstration to show that adding CO2 gas to water can make the water become acidic. Materials for the Demonstration Universal indicator solution Water 2 clear plastic cups Straw Teacher Preparation Make indicator solution for student groups Make a dilute universal indicator solution for this demonstration and for each student group by combining 625 mL water with 25 mL universal indicator solution. Pour at least 80 mL of this dilute universal indicator solution into a clean plastic cup for each student group. Note: Your local tap water is likely fine for the demonstration and activities in this lesson. If the indicator solution you make is not green, this means that your water is either acidic or basic. Remove as much air as possible and drop the Alka-Seltzer tablet through the small opening.

Let's take better care of our rare earth elements By Mike Pitts Despite their name, rare earth elements are not especially rare. So how come we are so worried about them running out? THE periodic table is a thing of beauty, yet we seem to be quite happy to exhaust parts of it before we’ve fully realised its potential. Helium will probably run out within the next 100 years. The latest part of the table to arouse such fears is a block of 17 metals known as the “rare earth elements”. Both the US and European Union have set up initiatives to look at these strategically important metals. Advertisement The rare earth elements – or as chemists call them, the lanthanides plus scandium and yttrium – might not be household names, but they are common in every household. Without lightweight magnets made from alloys of rare earth elements, computer hard-drives and iPod headphones and speakers would be impossible. Rare earth elements are also expected to play a big part in the future. Which brings us back to the topic of scarcity.