Dmitri Mendeleev Dmitri Mendeleev revolutionized our understanding of the properties of atoms and created a table that probably embellishes every chemistry classroom in the world. Early Life and Contributions: Dmitri Mendeleev was born at Tobolsk, Siberia in 1834. Covalent radius The covalent radius, rcov, is a measure of the size of an atom that forms part of one covalent bond. It is measured either in picometres (pm) or ångströms (Å), with 1 Å = 100 pm. In principle, the sum of the two covalent radii should equal the covalent bond length between two atoms, R(AB) = r(A) + r(B). Moreover, different radii can be introduced for single, double and triple bonds (r1, r2 and r3 below), in a purely operational sense. These relationships are certainly not exact because the size of an atom is not constant but depends on its chemical environment.
How to confuse a moral compass People can be tricked into reversing their opinions on moral issues, even to the point of constructing good arguments to support the opposite of their original positions, researchers report today in PLoS ONE1. The researchers, led by Lars Hall, a cognitive scientist at Lund University in Sweden, recruited 160 volunteers to fill out a 2-page survey on the extent to which they agreed with 12 statements — either about moral principles relating to society in general or about the morality of current issues in the news, from prostitution to the Israeli–Palestinian conflict. But the surveys also contained a ‘magic trick’. Each contained two sets of statements, one lightly glued on top of the other. Each survey was given on a clipboard, on the back of which the researchers had added a patch of glue.
Chemistry Laboratory Safety Rules Some rules are NOT made to be broken. That is true of the rules used in a chemistry lab. They are really, truly for your safety and not your humiliation. Follow the instructions given by your instructor or lab manual.Don't start a lab until you know all of the steps, from start to finish. If you have questions about any part of a procedure, get the answer before starting.Do Not Pipette By Mouth - EverYou say, "But it's only water." Even if it is, how clean do you think that glassware really is? Famous Scientists - Dmitri Ivanovich Mendeleev Dmitri Ivanovich Mendeleev Imagine if there was an element no one had ever seen before, but one day you announce that you know all its properties. People will call you crazy, won't they? But that's what Dmitri Mendeleev did! Mendeleev creates the Periodic Table The story goes like this.
My window is too large and wider than my screen. How to I resize it back? Something was downloaded to my computer while I was away this week. (My husband probably thought it was ok.) Now when I open an email thru Outlook it’s huge – it goes way off the screen to the right. I don’t know how to resize this or fix this. Can you please tell me in simple one and two syllable words just what to do? Oh, those husbands.
Monitoring the Earth from Space with SeaWiFS 2: Why study the oceans from space? Before we jump into the main subject of this presentation, it might be helpful to understand how we have learned what we know about the oceans in the past and how we are doing this today. Being an oceanographer and working for NASA has more often than not seriously confused people. The NEW Periodic Table Song (In Order) Lyrics There’s Hydrogen and Helium Then Lithium, Beryllium Boron, Carbon everywhere Nitrogen all through the air With Oxygen so you can breathe And Fluorine for your pretty teeth Neon to light up the signs Sodium for salty times Magnesium, Aluminium, Silicon Phosphorus, then Sulfur, Chlorine and Argon Potassium, and Calcium so you’ll grow strong Scandium, Titanium, Vanadium and Chromium and Manganese CHORUS This is the Periodic Table Noble gas is stable Halogens and Alkali react agressively Each period will see new outer shells While electrons are added moving to the right
The Suffolk System - The Region A strong pattern among banks in four states doesn’t prove a theory, of course. But another banking system in the antebellum period, the Suffolk Banking System of New England, offers further support for the importance of exposure to loss and authority to restrain risky banking activity. The System provides an example in which a motivated party (the Suffolk Bank of Boston) could and did take action to curb risktaking by (and improve survival of) interconnected banks (those who joined Suffolk’s noteclearing system) whose potential losses would negatively affect its interests
Mars interactive panorama: What it looks like to be there Imagine standing on Mars and looking around. Or instead of imagining, check out this interactive panorama. Nearly 300 images taken by two Curiosity rover cameras over the course of 13 days were used to create the best quality images we’ve ever seen of Mars. Hunting the Elements PBS Airdate: April 4, 2012 DAVID POGUE (Technology Guru): Why do bombs go boom? You have created fire! I could feel that puppy! How much gold is in 400 tons of dirt?
Life without the Fed: The Suffolk System - C.J. Maloney Suppose for a moment that Republican Congressman Ron Paul's fondest wish came true, and the Federal Reserve Bank was not only audited but closed down. As far-fetched as such a notion may seem, it would not be the first time in our nation's history that a central bank has been shuttered. For all the Fed's imposing grandeur, Ben Bernanke is running our third (albeit longest-running) try at a central bank. This country has lived without a central bank before and, if given the chance, could do so again. Most every American (led by Paul Krugman), though, would be horrified at the thought. There are certain functions that, due to their nature, many would argue can only be provided by the political authorities — police and fire protection are the prime examples that come to mind.
Secret Worlds: The Universe Within - Interactive Java Tutorial Secret Worlds: The Universe Within View the Milky Way at 10 million light years from the Earth. Then move through space towards the Earth in successive orders of magnitude until you reach a tall oak tree just outside the buildings of the National High Magnetic Field Laboratory in Tallahassee, Florida.