Chem flashcards for UNM 121 Exam 3 review test
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| Only two electrons, with opposing spins, are allowed in each orbital is known as the? | Hund's rule
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| Give the set of four quantum numbers that could represent the last electron added to the Ne atom. n=3,l=2,ml=1,ms=- 1/2 n=3,l=0,ml=1,ms=- 1/2 n = 2, l = 1, ml = 1, ms = - 1/2 n = 3, l = 2, ml =1 , ms = + 1/2 n = 3, l = 1, ml = 1, ms = + 1 | n = 2, l = 1, ml = 1, ms = - 1
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| True/False: An orbital that penetrates into the region occupied by core electrons is less shielded from nuclear charge than an orbital that does not penetrate and therefore has a lower energy. | True
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| The condensed electron configuration of krypton, element 36, is? | [Ar]3d^104s^24p^6
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| How many unpaired electrons are present in the ground state S atom? | 2
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| How many valence electrons does an atom of Ba possess? | 2
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| Place the following elements in order of decreasing atomic radius. Xe, Rb, Ar | Rb>Xe>Ar
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| Place the following elements in order of increasing atomic radius. Ca^2+, S^2-, Cl^- | Ca^2+<Cl^-<S^2-
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| Which of the following represent the Lewis structure for Ca^2+? | Ca^2+
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| Identify the compound with the lowest magnitude of lattice energy. CaO, KCl, KBr, SrO | KBr
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| Choose the compound below that should have the highest melting point according to the ionic bonding model. SrI_2, SrF_2, CaCl_2, SrBr_2, MgF_2 | MgF_2
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| Identify the weakest bond. | Single covalent bond.
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| Place the following elements in order of decreasing electronegativity. S, Cl, Se | Cl > S > Se
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| Choose the bond below that is most polar. H-Cl, H-F, H-Br, H-I, C-H | H-F
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| Give the number of valence electrons for SF_4. | 34
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| Give the approximate bond angle for a molecule with a tetrahedral shape. | 109.5 degrees
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| Determine the electron geometry and then the molecular geometry of PF_5. | trigonal bipyramidal and trigonal bipyramidal.
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| Determine the electron geometry and then the molecular geometry of ICl_2^-. | trigonal bipyramidal and linear
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| Determine the electron geometry, molecular geometry and polarity of SF_6. | octahedral, octahedral, nonpolar
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| Identify the number of electron group around a molecule with sp hybridization. | 2
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| Describe a pi bond. | side by side overlap of p orbitals.
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| How many of the following molecules have sp^3d hybridization on the central atom? SiCl_4, BrF_5, AsF_5, BrF_3 | 2
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