英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：

boron    音标拼音: [b'ɔr,ɑn]
n. 硼

硼

boron
n 1: a trivalent metalloid element; occurs both in a hard black
crystal and in the form of a yellow or brown powder [synonym:
{boron}, {B}, {atomic number 5}]

Boron \Bo"ron\ (b[=o]"r[o^]n), n. [See {Borax}.] (Chem.)
A nonmetallic element occurring abundantly in borax. It is
reduced with difficulty to the free state, when it can be
obtained in several different forms; viz., as a substance of
a deep olive color, in a semimetallic form, and in colorless
quadratic crystals similar to the diamond in hardness and
other properties. It occurs in nature also in boracite,
datolite, tourmaline, and some other minerals. Atomic number
5. Atomic weight 10.81. Symbol B.
[1913 Webster]

boron
Symbol: B
Atomic number: 5
Atomic weight: 10.811
An element of group 13 of the periodic table. There are two allotropes,
amorphous boron is a brown power, but metallic boron is black. The
metallic form is hard (9.3 on Mohs' scale) and a bad conductor in room
temperatures. It is never found free in nature. Boron-10 is used in
nuclear reactor control rods and shields. It was discovered in 1808 by
Sir
Humphry Davy and by J.L. Gay-Lussac and L.J. Thenard.


请选择你想看的字典辞典：
单词字典翻译
boron查看　boron　在百度字典中的解释百度英翻中〔查看〕
boron查看　boron　在Google字典中的解释Google英翻中〔查看〕
boron查看　boron　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Boron - Wikipedia
    Boron is a chemical element; it has symbol B and atomic number 5 In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder
  • Boron - Uses, Side Effects, ­and More - WebMD
    Overview: Boron is a mineral that may be used to improve bone health, although its benefits are not well defined It is available over the counter as a supplement and is usually well tolerated
  • What Does Boron Do for the Body? Benefits and Health Risks
    Boron is a trace mineral that affects the body in many ways Learn the health benefits and health risks of taking boron daily
  • Boron | Properties, Uses, Facts | Britannica
    Boron, chemical element that is a semimetal essential to plant growth and of wide industrial application Typical effects of long-term boron deficiency are stunted, misshapen growth; vegetable ‘brown heart’ and sugar beet ‘dry rot’ are among the disorders due to boron deficiency
  • What is Boron?16 Benefits, Side Effects, Dosage How to Take It
    What is Boron? Boron is a naturally occurring trace mineral found abundantly in the Earth’s crust, soil, water, and many plant-based foods Its chemical symbol is B, and it holds atomic number 5 on the periodic table
  • 13 Surprising Benefits of Boron - Organic Facts
    Boron is a biological trace mineral that has been studied for its many health benefits if consumed in the daily diet Health conditions such as arthritis and osteoporosis can be managed with medications prescribed by a doctor but more importantly with a diet that includes boron
  • Boron - Health Professional Fact Sheet - Office of Dietary Supplements . . .
    Boron is a trace element that is naturally present in many foods and available as a dietary supplement It is a structural component of plant cell walls and is required for plant growth, pollination, and seed formation [1]
  • Boron Uses, Benefits Side Effects - Drugs. com
    Learn about the uses and potential benefits of Boron including dosage guidelines, side effects, interactions and safety efficacy ratings





中文字典-英文字典  2005-2009