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CHEM121 Ex 3 Review

Chem flashcards for UNM 121 Exam 3 review test

Only two electrons, with opposing spins, are allowed in each orbital is known as the? Hund's rule
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
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
The condensed electron configuration of krypton, element 36, is? [Ar]3d^104s^24p^6
How many unpaired electrons are present in the ground state S atom? 2
How many valence electrons does an atom of Ba possess? 2
Place the following elements in order of decreasing atomic radius. Xe, Rb, Ar Rb>Xe>Ar
Place the following elements in order of increasing atomic radius. Ca^2+, S^2-, Cl^- Ca^2+<Cl^-<S^2-
Which of the following represent the Lewis structure for Ca^2+? Ca^2+
Identify the compound with the lowest magnitude of lattice energy. CaO, KCl, KBr, SrO KBr
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
Identify the weakest bond. Single covalent bond.
Place the following elements in order of decreasing electronegativity. S, Cl, Se Cl > S > Se
Choose the bond below that is most polar. H-Cl, H-F, H-Br, H-I, C-H H-F
Give the number of valence electrons for SF_4. 34
Give the approximate bond angle for a molecule with a tetrahedral shape. 109.5 degrees
Determine the electron geometry and then the molecular geometry of PF_5. trigonal bipyramidal and trigonal bipyramidal.
Determine the electron geometry and then the molecular geometry of ICl_2^-. trigonal bipyramidal and linear
Determine the electron geometry, molecular geometry and polarity of SF_6. octahedral, octahedral, nonpolar
Identify the number of electron group around a molecule with sp hybridization. 2
Describe a pi bond. side by side overlap of p orbitals.
How many of the following molecules have sp^3d hybridization on the central atom? SiCl_4, BrF_5, AsF_5, BrF_3 2
Created by: Susanannholland



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