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相关概念视频

The Periodic Table03:25

The Periodic Table

As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
Periodic Classification of the Elements04:00

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
Properties of Transition Metals02:58

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...

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相关实验视频

Updated: Jul 12, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
10:42

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

门列维:双价性和其他化学性质.

E K Hulet, R W Lougheed, J D Brady

    Science (New York, N.Y.)
    |October 27, 1967
    PubMed
    概括

    门列维 (元素101) 是第一个在溶液中形成稳定的双价离子的动态元素. 研究人员实现了这种减少,并估计了Md(2+) /Md(3+) 反氧潜力.

    科学领域:

    • 放射化学 放射化学是指辐射化学.
    • 动因化物化学 动因化物化学
    • 解决方案化学 解决方案化学

    背景情况:

    • 孟德列维 (Md) 是第101元素,是一种合成的动因化物.
    • 了解重元素的氧化状态和溶液化学对于核科学和化学至关重要.

    研究的目的:

    • 为了研究孟德列维的溶液化学.
    • 为了确定孟德列维能否形成稳定的双价离子.
    • 为了描述孟德列维的氧化还原行为.

    主要方法:

    • 使用各种还原剂 (Zn粉尘,Zn-Hg合金,Cr(2+),Eu(2+),V(2+)) 从3+氧化状态降低孟德列维.
    • 使用V(2+) 进行平衡测量,以估计Md(2+) /Md(3+) 对的氧还原潜力.
    • 将Md(3+) 的化学行为与其他三价乙化物和化物进行比较.

    主要成果:

    • 孟德列成功降解为溶液中的稳定双价离子 (Md(2+)).
    • 据估计,Md(2+) /Md(3+) 对的氧化还原潜力大约为+0.2 V.
    • 发现Md(3+) 的化学行为与三价乙化物和化物相似.
    • 没有观察到Md(3+) 氧化到更高的氧化状态使用 bismuthate .

    更多相关视频

    Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
    09:45

    Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

    Published on: March 20, 2017

    Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
    08:15

    Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

    Published on: February 11, 2012

    相关实验视频

    Last Updated: Jul 12, 2026

    Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
    10:42

    Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

    Published on: December 29, 2016

    Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
    09:45

    Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

    Published on: March 20, 2017

    Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
    08:15

    Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

    Published on: February 11, 2012

    结论:

    • 孟德列维是第一个能够在溶液中形成稳定的双价离子的动态元素.
    • 门德列维的双价态与其三价态相比,表现出不同的氧化还原特性.
    • 证实了Md(3+) 与其他三价f元素的化学相似性.