离子和元素,使用哪一个是正确的术语在讨论地球科学中化合物?江南体育网页版- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 10 - t01:36:51z //www.hoelymoley.com/feeds/question/8428 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/8428 2 离子和元素,使用哪一个是正确的术语在讨论地球科学中化合物?江南体育网页版 g . Gip //www.hoelymoley.com/users/5923 2016 - 07 - 22 - t10:33:52z 2016 - 07 - 22 - t11:13:07z < p >不同的教科书使用不同的术语在讨论相同的化合物,例如当讨论矿物质…< / p >

  1. Elements / Compounds

    • Sulfide minerals consist of metallic elements in chemical combination with the element sulfur
    • Phosphate are a group of minerals of one or more metallic elements chemically associated with the phosphate compound PO4

  2. Ions

    • Sulfide ions (S$^2$-) bond with a number of positive ions to form the sulfides
    • Phosphorous in the form of phosphate ions (PO4$^3$-) binds with positive ions to form the phosphate minerals

Are element/compounds and ions the same thing?
If they are the same, why the two terms?
Which is better terminology?

I'm just after a basic understanding of how elements form rocks and being able to differentiate between this terminology is beyond my layman abilities.

//www.hoelymoley.com/questions/8428/-/8429 # 8429 3 答案由Gimelist离子和元素,使用哪一个是正确的术语在讨论地球科学中化合物?江南体育网页版 Gimelist //www.hoelymoley.com/users/725 2016 - 07 - 22 - t10:53:15z 2016 - 07 - 22 - t10:53:15z 李< ul > < > < p >元素只是一个特定类型的原子。镁、氧、硫等。这些都是元素。< / p >

  • Compounds are several different types of atoms (that is, elements) bonded together. For example, magnesium oxide (MgO), or iron sulfide (FeS).

  • Ions are charged atoms or compounds (also known as species in some cases). Ions can be monoatomic (consisting of only one atom, or element) or polyatomic (consisting of more than one type of atom). Cations are positively charged (like Ca2+) and anions are negatively charged (like O2-). Polyatomic ions that occur in geological contexts are usually anions, with carbonate (CO32-) and sulfate (SO42-) being two good examples.

    • All ions are elements (or combination of them). Not all elements are ions. We geologists and geochemists use these terms interchangeably all the time. I think that using ions may be slightly better, particularly in the case of sulfur. Because sulfur in minerals can be either in sulfate or sulfide form, just saying "sulfur" gives little information. The properties of sulfate and sulfide minerals are completely different, so it's actually useful to know.

    Sulfide ions (S2-) bond with a number of positive ions to form the sulfides

    Not strictly correct, because the bonding in many sulfide minerals is a combination of covalent and metallic bonding, and it only has a little ionic character. Still, even in cases when the bonding is not ionic (such as in sulfide minerals), we still often talk of them of ions because it's convenient and easy.

    Sulfide minerals consist of metallic elements in chemical combination with elemental sulfur

    This statement is not correct. When we speak of "elemental" elements, we mean that they are monoatomic compounds (or minerals). In the case of sulfur, it will be the yellow sulfur mineral. Gold, copper and silver and other example of "elemental" minerals. Once the sulfur is bonded to other metals, it is no longer elemental. It is part of a sulfide mineral.
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