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Lewis Structures and Formal Charges02:19

Lewis Structures and Formal Charges

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Lewis symbols can be used to indicate the formation of covalent bonds, which are shown in Lewis structures—drawings that describe the bonding in molecules and polyatomic ions. The periodic table can be used to predict the number of valence electrons in an atom and the number of bonds that will be formed to reach an octet. Group 18 elements, such as argon and helium, have filled electron configurations and thus rarely participate in chemical bonding. However, atoms from group 17, such as...
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Formal Charges02:42

Formal Charges

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In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Atomic Radii and Effective Nuclear Charge03:08

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Electric Charges01:11

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From lightning during thunderstorms to electronic devices, the phenomenon of electromagnetism is all around us. The electromagnetic force is one of the four fundamental forces of nature. It has been known to humanity in various forms for thousands of years. For example, the ancient Greek philosopher Thales of Miletus recorded his experiments on static electricity using amber and fur in the sixth century BC.
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Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
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陽性電荷の雷の枝で発見された針のような構造

B M Hare1, O Scholten2,3, J Dwyer4

  • 1KVI-Center for Advanced Radiation Technology, University of Groningen, Groningen, The Netherlands. b.h.hare@rug.nl.

Nature
|April 19, 2019
PubMed
まとめ

新しい 研究 に よれ ば",針"という 小さな プラズマ の 構造 が 雷 の 陽性 導体 から の 放射 源 の 主要 な 源 と なっ て い ます. これらの構造は,リーダー接続の断絶と 複数の雲から地への雷の発生を説明します.

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科学分野:

  • 大気物理学
  • プラズマ物理学
  • 電磁気学

背景:

  • リーダと呼ばれる プラズマチャネルが関与する 自然現象です
  • ネガティブなリーダーは ラジオパルスを発し ポジティブなリーダーは 低い周波数の放射線を 発し 異なる振る舞いをします
  • リーダーシップの断絶に関する以前の理論は ポジティブなリーダーシップの行動について 完全な説明を欠いています

研究 の 目的:

  • 雷の陽性誘導体からの放射源を調査する.
  • 雲から地への複数の稲妻発生の背後にあるメカニズムを理解する

主な方法:

  • 雷の3次元ラジオインターフェロメトリック観測
  • 閃電現象の高解像度空間時間画像

主要な成果:

  • プラズマの小さな構造を特定し,それを"針"と名付けました. 陽性リーダーからの放射能の主要な源として.
  • これらの"針"は,リーダーから電荷を排出するように見えます.
  • "針"と"リード・ディスカネクション"の相関が分かった

結論:

  • "ニードル"はポジティブ・リーダーから放射される.
  • "ニードル"は ポジティブなリーダーが ポジティブなリーダーから 切り離される理由を 明らかにしています
  • "ニードル"は,雲から地への雷の複数の接続も説明できます.