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CHEM121 Ex 3 Review
Chem flashcards for UNM 121 Exam 3 review test
| Question | Answer |
|---|---|
| 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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