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5 days ago · To predict three-dimensional molecular geometry of simple, symmetric molecules we look to the valence-shell electron-pair repulsion (VSEPR) model. Shape is predicted using the number of electrons around the central atom in the Lewis structure.
4 days ago · A few molecules have a tetrahedral geometry with no central atom. An inorganic example is tetraphosphorus (P 4) which has four phosphorus atoms at the vertices of a tetrahedron and each bonded to the other three. An organic example is tetrahedrane (C 4 H 4) with four carbon atoms each bonded to one hydrogen and the other three carbons.
1 day ago · In summary, Bi 2 Se 3 /SnSe 2 2D/2D heterostructures are successfully synthesized and used for NO 2 detection. The optimized Bi 2 Se 3 /SnSe 2 heterostructure exhibited rapid response towards NO 2 gas. Compared to pure SnSe 2, the response time was significantly reduced from 73 to 15 s (10 ppm).
4 days ago · Lewis dot structure of a Hydroxide ion compared to a hydroxyl radical. In chemistry, a radical, also known as a free radical, is an atom, molecule, or ion that has at least one unpaired valence electron. [1] [2] With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize.
4 days ago · An important feature of water is its polar nature. The structure has a bent molecular geometry for the two hydrogens from the oxygen vertex. The oxygen atom also has two lone pairs of electrons.
5 days ago · Complete solution: Alkali metal nitrates on heating produce respective nitrite and oxygen gas. The general representation of the reaction is as follows: \ [\begin {gathered} MN {O_3}\,\xrightarrow {\Delta }\,MN {O_2}\,\,\, + \,\,\,\,\,\frac {1} {2} {O_2} \\ nitrate \,\,\,\,\,\,\,\,\,\,\,\,\,nitrite\,\,\,\,\,oxygen gas \\ \end {gathered} \]
5 days ago · I'm reading Fangyang Zheng's Complex Differential Geometry. I have a problem with notation while reading the following theorem. Theorem 7.23 (Yau's Schwarz Lemma). Let $(M, h)$ be a complete Kähler manifold with Ricci curvature $r \geq a$, and $(N, g)$ a Hermitian manifold with holomorphic sectional curvature $H \leq b<0$.
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