以文本方式查看主题

-  国际泵阀采购论坛-泵水泵油泵螺杆泵液下泵离心泵阀阀门采购阀门销售泵阀论坛  (http://www.pvwww.com/pvbbs/index.asp)
--  English Only  (http://www.pvwww.com/pvbbs/list.asp?boardid=14)
----  Basic Information  (http://www.pvwww.com/pvbbs/dispbbs.asp?boardid=14&id=7562)
--  作者：山东水泵厂
--  发布时间：2007/10/31 21:01:14
--  Basic Information

Basic Information

Name: Scandium
Symbol: Sc
Atomic Number: 21
Atomic Mass: 44.95591 amu
Melting Point: 1539.0 °C (1812.15 K, 2802.2 °F)
Boiling Point: 2832.0 °C (3105.15 K, 5129.6 °F)
Number of Protons/Electrons: 21
Number of Neutrons: 24
Classification: Transition Metal
Crystal Structure: Hexagonal
Density @ 293 K: 2.989 g/cm3
Color: silvery

Atomic Structure
  
Number of Energy Levels: 4

First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 9
Fourth Energy Level: 2 


Isotopes
Isotope Half Life
Sc-44 3.92 hours
Sc-45 Stable
Sc-46 83.81 days
Sc-46m 18.72 seconds
Sc-47 3.34 days
Sc-48 43.67 hours
Sc-49 57.3 minutes


Facts

Date of Discovery: 1879
Discoverer: Lars Nilson
Name Origin: From Scandinavia
Uses: No uses known
Obtained From: minerals (thortveitile, wiikite)
--  作者：山东水泵厂
--  发布时间：2007/11/24 10:04:49
--  
3ks