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- 14:41 x Which one of the following statements is correct? A. All metals are shiny and can conduct electricity. B. Metalloids are referred to as semiconductors. C. Density of metals are the opposite of non-metals, while metalloids have no density. D. Non-metals are used as conductors because they do conduct well. 5문 • T Which one of the following statements is correct: The name of As2O3 is arsenic trioxide. The name of O²- is an oxygen ion. The name of Fe2(SO4)3 is Iron (III) sulfite. The name of MnO4 is permanganate. A. B. C. D. Which one of the following statements regarding quantum numbers and shells is correct? A. The primary quantum number, n, can have a number of 1.5. B. A subshell p can hold 6 electrons. C. n = 2 can have the following subshells: s, s and p. D. A d subshell can have 3 orbitals. Which one of the following least describes something related to the periodic table? A. Noble gas elements B. Alkali metals C. Alkynes D. Halides Add a caption... 4G Ò > Status (Custom)7.72 How does an MSN differ from amorphous silica so that is has improved biocompatibility?One of the allotropes of sulfur is a ring of eight sulfur atoms. Draw the Lewis structure for the S8ring. Comment on whether that ring will be planar or not.b.The S8ring can be oxidized to produce S8O, in which the oxygen atom is bonded to one of the sulfur atoms and the ring is intact. Draw the Lewis structure for S8O and comment onwhether this oxidized ring will be planar or not.
- Lewi's dot structure for nitrogen tetrabromide ionSelect among the statements below the ones which are TRUE. There may be more than one true statement in the choices. a. In the band model, the electrons are assumed to occupy molecular orbitals.b. Usually, the gaseous form of a substance can still be solidified near (but not beyond) the critical point.c. In the electron sea model, the valence electrons in metals are assumed to be fixed in the lattice points.d. Conduction bands are closely spaced molecular orbitals with filled electron spaces.e. In p-type semiconductors, the dopant element typically contains three-valence electrons. Considering intermolecular forces, which of the following is INCORRECT?a. Ammonia, NH3 : H-bondingb. Acetone, H3C-C(=O)-CH3 : Dipole-dipolec. Bromine, Br2 : Dispersion forcesd. Formaldehyde, H2C=O : H-bondingWhich lattice plane corresponds to the (212) set of planes?
- 8. Elements that have their highest energy electrons in a filled band of molecular orbitals that is separated from the lowest empty band by an energy difference much too large for electrons to jump between bands are called a. conductors b. isomorphs C. metals d. insulators e. semiconductorsWhat is graphene? Why is graphene unique?Why are these bravais lattices the same? B-monoclinic and primitive (P)-monoclinic (if b is the unique axis) base-centered (C)-monoclinic and body-centered (I) monoclinic (if b is the unique axis)
- Give answers of the following. a. Which allotropic forms of carbon are conductor and which are non-conductors and why. b. Why diamond is hard while graphite is soft.c. Describe the Lewis structure of H2SO4, H2S4O6 and HNO3 in detail.a. How many types of metal bond theories are there? Explain all theories in detail. b. Compare the strength of metallic bonding of Group 1A and Group 2A metals and explain why?(b) Shown below are two schematic band diagrams for silicon. Answer the following questions: (i) For phosphorous-doped silicon, draw a dashed line denoting the location of the additional state(s) created by the phosphorus at room temperature. Explain your answer. (ii) For phosphorous-doped silicon, draw a dashed line denoting the location of electrons donated by the phosphorus at room temperature. Explain your answer. Conduction Conduction band band Band Band дар gap Valence Valence band band (i) (ii)