|
so sleep alone tonight
My name is ღ||汇嘉||SOPHIAღ. Give me presents! On 22061996 :D [Cancer] [CHRISTIAN] PLMGSS 2.1 I love Aaron (: |
|
|
about this blog
This blog was opened by (SOPHIAARON) to accomodate (SOPHIA)'s Science journal.Do enjoy your stay here, and don't take what's not yours! tagboard
ShoutMix chat widget br> affiliates
DORCAS!!!(: MELISSA LISA LISHAN RACHEL RADIENT JANELLE JASLEY SEOWHWEE STELLA STACEY SARAH SHIYU JOYI Bue. Bue. Bue. archives
Videos. (:
-------------Physics------------Liquifaction. How to get out of a quicksand. Math Definitions : What Is Terminal Velocity. Newton's 3 laws of motion. Titration Technique using a burette How to use a pipette. Indroduction to Frictional force. Tacoma Bridge Collapsed! ---------------Chemistry---------- Forensic Video Periodic table song(: Crystal structures: graphite and diamond Chromotography- Separation of MIxtures Separation: Iron from Salt & Sand Mixture Steam Distillation Fractional Distillation Video Video Video Video Video Video Video Video Video Video Video Video Video credits
Design: doughnutcrazyIcon: morphine_kissed Do credit accordingly if you changed the icon. |
Chemistry- 6
How do scientist know that we've discovered all the elements in/on earth?*Just an extra information: There are 110 elements on Earth to date.* Answer: Elements are defined by the number of protons they have in their nucleus. Hydrogen, for example has just 1, while uranium has 92 protons. 91 elements have been found to occur naturally on Earth (technitium is radioactive with a short half life, and does not occur in nature). In addition to these, scientists have created up to element 118. All the elements from 93 on up are radioactive and most exist for vey short spans of time. As nuclei get larger, they get more unstable, so "unknown" elements are not going to be found occuring in nature.In addition, we can measure, from the force of the planet's gravity, the density of the core, and find it corresponds to iron and nickel, not to higher elements to any degree. source: http://answers.yahoo.com/question/index?qid=20080320200920AA1lpZm |