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CH 104 Lecture Notes - Lecture 10: Electron Configuration, Nonmetal, Noble Gas

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25 Oct 2016

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University of Alabama

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Document Summary

Joining of two atoms in a stable arrangement. Elements aim to reach the electron configuration of the noble gas closest to them on the periodic table. Number of bonds + number of lone pairs = 4 (except hydrogen) Formed between 2 nonmetals or a nonmetal and a metalloid. Unshared electron pairs are called lone pairs. Main group elements share electrons until they reach an octet. Hydrogen shares electrons until it reaches 2. Shows the location of all valence electrons. Use multiple bonds to fill octets: a double bond contains 4 electrons, a triple contains 6, triple bonds usually involve c,n and o. Total valence electrons- single electron bonds= number of lone pairs in structure. Elements in group 3a only need 6 electrons. Subtract one electron for every positive charge. Add one electron for every negative charge. Two lewis structures that have the same arrangement of atoms but a different arrangement of electrons.

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Related Questions

Construct the Lewis structure model for the covalent compoundphosgene (COCl2) using the following steps.
1) The total number of valence electrons in COCl2 is ____.
2)In this compound, carbon is the central atom. Arrange the atomiccores appropriately in the space below.
3)Add electron pairs to show the bonds between the atoms.
4)Assigning the remaining valence electrons so that each atom hasan octet of electrons, write the Lewis structure for COCl2 in thebox.

STRC 434: Wricing Lewis Symbols and Lewis Strucnures (4) Write the Lewis structure for the ionic com 5. Construct the Lewis structure model for the cova pound potassium chioride in the box. lent compound sulfur difluoride (SF2) using the tollow ing steps (1) atom is The number of valence electrons in the sulfur . The total number of valence electrons is the total Lewis structure of potassium chloride How does the written Lewis structure for po, in the two fluorine atoms isHence number ol valence electrons in SF's (5) tassium chioride differ from that ot hydrogen chloride? (2) Arrange the atomic cores for the two fluorine atoms with the sultur atom as the central atom in the space below. (3) Rewrite the atomic cores in the space below. Place an electron pair between each fluorine and sulfur core. Write the Lewis structure for SF2 in the box, lent compound hydrogen sulfide (H2S) using the fol- distributing the remaining valence electrons so that all 4. Construct the Lewis structure model for the cova- (4) lowing steps. three atoms are in accordance with the octet rule. (1) The total number of valence electrons in the two hydrogen atoms is ; the sulfur atom has Hence, the total number of valence electrons in the compound is Lewis structure of SF2 (2) Write the atomic cores for the hydrogen atoms and the sulfur atom in the space below. Because sulfur is the central atom in this molecule, ar- range the cores so that the hydrogen atoms are on ei ther side of the sulfur atom. 6. Construct the Lewis structure model for the cova- lent compound methylene chloride (CH2C) The number of valence electrons in the car- The total number of valence elec (1) bon atom is trons in the two hydrogen atoms is number of valence electrons in the two chlorine atoms is trons in CH2C12 is The total (3) Rewrite the atomic cores in the space below. Place an electron pair between each hydrogen atom and the suilfur atom. Hence, the total number of valence elec- (2) Position the atomic core for carbon as the (4) Write the Lewis structure for hydrogen sulfide central atom in the space below, and place the other in the box, distributing the remaining valence electrons cores around it so that the hydrogen atoms are in accordance with the duet rule and the sulfur atom is in accordance with the octet rule. (3) Rewrite your arrangement of atomic cores ir the space below, joining the cores with electron pairs to form the necessary bonds. Lewis structure of H2S