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how was sodium discovered

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Question:7)Predict which element would be more reactive, sodium or potassium why do you think so? 8) Explain what the shielding effect is and predict whether the shielding effect is greater in bromine or iodine atoms 9) The lanthanide/actinide series can be found at the bottom of the periodic table. Explain why it is found there and how this location impacts trends in the periodic table such as atomic number and electron configuration Please help me!!! I need short answers for each one. Thanks a lot

Answers:I can answer number 9 for you. the reason it's at the bottom is because when you stick it in the periodic table it's in the 6 and 7 energy level. But when you write the electron configuration you minus two from it because...well I don't want to get to far into detail but it's basically because there's not enough electrons to fill the entire sub shell.

Question:How would you expect its physical properties to compare with those of the pre-discovered alkali metals? Thank you if you can even give me a hint about this! I have no idea!

Answers:There are only six known alkali metal elements: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). The next element in that group would be #119, with a temporary name of ununennium (Uue). But most likely it would be radioactive, and decay to something else in just a few microseconds.

Question:I have to do a project for my Chemistry class about the element Copper. Can someone please tell me who discovered it, when, where, and how? Thanks, Kimmy

Answers:Hey Babe, The sumerians and Ancient egyptians, as well as almost every other ancient culture has used copper. Just too broad of a history for a one man origin. There are signs of smelting of it in these civilizations. I hope thats a help sweetie!

Question:my chemistry project will be about alkaline metals, and alkaline compouns, i alredy have lithium, potassium , rubidium , caesium and francium, but im missig sodium. so my teacher told my team that we will have an extra point if we make sodium by naoh, so, im lookinf for a procedure of meltig NaOH for the electrolysis, but..... if i use electrolysis, na will be separed of oh, but i dont know if OH will make water or will be liberated as a gas leving pure sodium tnks

Answers:Sodium was first isolated by Davy in 1807 by electrolysis of caustic soda. http://www.speclab.com/elements/sodium.htm Davy was a pioneer in the field of electrolysis using the battery to split up common compounds and thus prepare many new elements. He went on to electrolyse molten salts and discovered several new metals, especially sodium and potassium, highly reactive elements known as the alkali metals. http://en.wikipedia.org/wiki/Sir_Humphry_Davy

From Youtube

4. Discovering Exoplanets: Hot Jupiters :Frontiers/Controversies in Astrophysics (ASTR 160) The formation of planets is discussed with a special emphasis on the bodies in the Solar System. Planetary differences between the celestial bodies in the Inner and Outer Solar System are observed. Professor Bailyn explains how the outlook of our Solar System can predict what other star systems may look like. It is demonstrated how momentum equations are applied in astronomers' search for exoplanets. Planet velocities are discussed and compared in relation to a planet's mass. Finally, the Doppler shift is introduced and students learn how it is used to measure the velocity of distant objects, such as galaxies and planets. Complete course materials are available at the Open Yale Courses website: open.yale.edu This course was recorded in Spring 2007.

Planet From Another Galaxy Discovered :Science & Reason on Facebook: tinyurl.com ESOcast 24: First planet of extragalactic origin An exoplanet orbiting a star that entered our galaxy, the Milky Way, from another galaxy has been detected by a European team of astronomers using the MPG/ESO 2.2-metre telescope at ESO's La Silla Observatory in Chile. The Jupiter-like planet is particularly unusual, as it is orbiting a star nearing the end of its life and could be about to be engulfed by it, giving clues about the fate of our own planetary system in the distant future. --- Please subscribe to Science & Reason: www.youtube.com www.youtube.com www.youtube.com www.youtube.com --- Planet From Another Galaxy Discovered - The first planet of extragalactic origin In this episode we are going to find out how an act of galactic cannibalism has brought a planet from another galaxy within astronomers' reach. Astronomers have detected nearly 500 planets orbiting stars in our cosmic neighbourhood, but none outside our Milky Way has been confirmed. Now, however, a planet weighing at least 1.25 times as much as Jupiter has been discovered orbiting a star of extragalactic origin, even though the star now finds itself within our own galaxy. The star, which is known as HIP 13044, lies about 2000 light-years from Earth and is part of the so-called Helmi stream. This stream of stars originally belonged to a dwarf galaxy, which was devoured by our Milky Way in an act of galactic cannibalism six to nine billion years ago ...