- published: 15 Feb 2017
- views: 911642
Valence or valency may refer to:
In several fields the valence of an element refers to the number of elements to which it can connect:
Khan Academy is a non-profit educational organization created in 2006 by educator Salman Khan with the aim of providing a free, world-class education for anyone, anywhere. The organization produces short lectures in the form of YouTube videos. In addition to micro lectures, the organization's website features practice exercises and tools for educators. All resources are available for free to anyone around the world. The main language of the website is English, but the content is also available in other languages.
The founder of the organization, Salman Khan, was born in New Orleans, Louisiana, United States to immigrant parents from Bangladesh and India. After earning three degrees from the Massachusetts Institute of Technology (a BS in mathematics, a BS in electrical engineering and computer science, and an MEng in electrical engineering and computer science), he pursued an MBA from Harvard Business School.
In late 2004, Khan began tutoring his cousin Nadia who needed help with math using Yahoo!'s Doodle notepad.When other relatives and friends sought similar help, he decided that it would be more practical to distribute the tutorials on YouTube. The videos' popularity and the testimonials of appreciative students prompted Khan to quit his job in finance as a hedge fund analyst at Connective Capital Management in 2009, and focus on the tutorials (then released under the moniker "Khan Academy") full-time.
In chemistry, a valence electron is an electron that is associated with an atom, and that can participate in the formation of a chemical bond; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair. The presence of valence electrons can determine the element's chemical properties and whether it may bond with other elements: For a main group element, a valence electron can only be in the outermost electron shell. In a transition metal, a valence electron can also be in an inner shell.
An atom with a closed shell of valence electrons (corresponding to an electron configuration s2p6) tends to be chemically inert. Atoms with one or two more valence electrons than are needed for a "closed" shell are highly reactive because it requires relatively low energy (compared to the lattice enthalpy) to remove the extra valence electrons to form a positive ion. Atoms with one or two valence electrons fewer than are needed to form a closed shell are also highly reactive because of a tendency either to gain the missing valence electrons (thereby forming a negative ion), or to share valence electrons (thereby forming a covalent bond).
NCS may refer to:
Actors: Chris Mulkey (actor), Pierre David (producer), Pierre David (producer), Nick Cassavetes (actor), Robert Shaye (producer), James Remar (actor), Fran Ryan (actress), Robert Shaye (actor), Brian McMillan (miscellaneous crew), Clayton Landey (actor), Ted White (actor), Sara Risher (producer), Jay Ferguson (composer), Sara Risher (producer), Larry A. Thompson (producer),
Plot: Joe Dylanne is a plainclothes NYC cop with a badge... and a robust personality. He always resorts to unconventional methods in order to capture the city's slickest criminals. When Dylanne receives a message from Katy, an old sweetheart of his, the news is not as pleasant as he anticipated. Rather, it is an imperative call for help. Dylanne must swing into full action. This cop must travel to a remote location in the northwest in order to investigate the disappearances of his friend's relatives. It turns out that most of Kate's relatives have been murdered in cold blood. The only survivor of the slaughter is Joshua, an angst-ridden survivalist who explains to Dylanne about a sophisticated plan implicating marijuana plant growers. Dylanne and Joshua must trespass enemy territory in the name of revenge...
Keywords: cannabis, dead-boy, dual-wield, forest, independent-film, murder, police-shootout, small-town, street-shootout, teenager-fighting-adultActors: Vladan Zivkovic (actor), Dragomir Felba (actor), Vojislav Brajovic (actor), Stole Arandjelovic (actor), Milos Kandic (actor), Miodrag Krstovic (actor), Predrag Milinkovic (actor), Dusan Janicijevic (actor), Rastislav Jovic (actor), Bozidar Pavicevic-Longa (actor), Dragomir Stanojevic (actor), Goran Sultanovic (actor), Marko Todorovic (actor), Pavle Vuisic (actor), Velimir 'Bata' Zivojinovic (actor),
Genres: Crime,Actors: Rudolf Rhomberg (actor), Peter Arens (actor), Lambert Hamel (actor), Klaus Höhne (actor), Michael Janisch (actor), Karl Lieffen (actor), Ulli Philipp (actress), Charlotte Flemming (costume designer), Heinrich Gretler (actor), Tankred Dorst (writer), Karin Rasenack (actress), Claus Ringer (actor), Günther König (actor), Peter Brogle (actor), Werner Düggelin (director),
Genres: ,NoCopyrightSounds, music without limitations. Our playlist on Spotify → http://spoti.fi/NCS Download this track for FREE: https://www.hive.co/l/2gvjr Support on Spotify/iTunes/Apple Music: [coming soon] [Connect with NCS] • http://soundcloud.com/nocopyrightsounds • http://instagram.com/nocopyrightsounds • http://facebook.com/NoCopyrightSounds • http://twitch.tv/nocopyrightsounds • http://twitter.com/NCSounds • http://spoti.fi/NCS [Valence] • https://soundcloud.com/valence-music • https://twitter.com/miguel_valence_ • https://www.facebook.com/ValenceMusicOfficial/ [NCS YouTube Playlists] Trap: http://bit.ly/NCStrap House: http://bit.ly/NCShouse Dubstep: http://bit.ly/NCSdubstep Drumstep: http://bit.ly/NCSdrumstep Hardstyle: http://bit.ly/NCShardstyle Drum&Bass;: http://bit.ly/NCSdrumandb...
To see all my Chemistry videos, check out http://socratic.org/chemistry Where do electrons live in atoms? They live in energy levels or shells, which are varying distances from the nucleus, and can hold varying numbers of electrons. The most important electrons in an atom are the valence electrons, which are in the outermost energy level or shell. We'll look at how to determine the number of valence electrons in an atom, based on which column it is in on the periodic table.
NoCopyrightSounds, music without limitations. NCS Electronic Playlist → http://bit.ly/NCSelectronicHour Download this track for FREE: https://www.hive.co/l/2gvjr Support on Spotify/iTunes/Apple Music: [coming soon] [Connect with NCS] • http://soundcloud.com/nocopyrightsounds • http://instagram.com/nocopyrightsounds • http://facebook.com/NoCopyrightSounds • http://twitch.tv/nocopyrightsounds • http://twitter.com/NCSounds • http://spoti.fi/NCS [Valence] • https://soundcloud.com/valence-music • https://www.youtube.com/user/adrenalinmusicpure • https://twitter.com/miguel_valence_ • https://www.facebook.com/ValenceMusicOfficial NCS YouTube Playlists 〱 NCS Trap http://bit.ly/NCStrapHour 〱 NCS House http://bit.ly/NCShouseHour 〱 NCS Dubstep http://bit.ly/NCSdubstepHour 〱 NCS Drumstep http://bi...
How to get Lewis structures from electron configuration, and how valence electrons are involved in forming bonds. Created by Jay. Watch the next lesson: https://www.khanacademy.org/science/chemistry/periodic-table/periodic-table-trends-bonding/v/atomic-radius-trend?utm_source=YT&utm;_medium=Desc&utm;_campaign=chemistry Missed the previous lesson? https://www.khanacademy.org/science/chemistry/periodic-table/copy-of-periodic-table-of-elements/v/periodic-table-transition-metals?utm_source=YT&utm;_medium=Desc&utm;_campaign=chemistry Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of alge...
An explanation and practice for finding the number of valence electrons for elements on the periodic table. This is a key first step for drawing Lewis dot structures for molecules.
Valence Electrons Tutorial via Draw My Science by Mr. Linsangan
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Welcoming Party / This Is System
This is system for your life we exist
We'll take your mind and violently twist into
A shape so desperate you'll make us your life
And like your mother we will hold you so tight
And we'll grow off our pain constant aggression.
We're sedatives for your alteration
We'll drag you down for the rest of your life
And then the system succeeds
The day you have died
THIS IS SYSTEM
We welcome you child and we open our arms of greetings
We'll treat you just right and we'll change you inside and you'll see
That it's so necessary for you to accept
Or we'll strap you down 'til we gain your respect
You'll see it our way and you'll never question what we say
See me I am crying through eyes of pain!
Cold hearted system I cannot escape!
Much more comfortable now, much more relaxed, just slightly sedated
And when the lights go out, you will recall the pain that you've faded
And in the blackened pitch you hear the other guests screaming
And you can feel the horror of their hated dreams
We'll strap you down tight
Shocking your mind for screaming
You poor child with pain in your eyes
We never hear you cry
We'd like to think that you are someone's mistake
And so we lock you away
There's got to be some kind of end
A way out from under this horror
Something out there beyond the pain
That welcomes with comfort
We'll let you go this time and it's your mistake
You will miss our hate and desire our pain
And you will be back
Because they will not understand you
You feared man with the hate in your eyes
Looks like you don't mind dying
We'd like to think that you're a social mistake