CHEM 14A Chapter Notes - Chapter 2C.2: Phosphorus Trichloride, Hypervalent Molecule, Noble Gas

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turquoisemoose666

18 Nov 2020

School

UCLA

Department

Chemistry and Biochemistry

Course

CHEM 14A

Professor

Dr.Laurence Lavelle

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Document Summary

The octet rule states that electron sharing continues until eight electrons fill the outer shell of an atom to give a noble gas ns2np6 valence-shell configuration. Expanded valence shell: can accommodate more than 8 valence electrons. The expansion can arise in either of two ways: More atoms might attach to a central atom than is allowed by the octet rule. The number of atoms is the same as that allowed by the octet rule, but some single bonds are replaced by double bonds. Hypervalent compound: a compound that contains an atom with more atoms attached to it than is permitted by the octet rule. Formation of compounds with different numbers of attached atoms. The second possibility is associated with the ability to write different lewis structures for a molecule with different arrangements of electron pairs. Only p-block atoms in period 3 or later periods can expand their valence shells.

Related Questions

Consider some of the exceptions to the octet rule, then read the statements below and use the checkboxes to indicate all of the statements that are true. MORE THAN ONE ANSWER

The compound NH5 provides a valid example of expanded valence.

The compound SF6 provides a valid example of expanded valence.

In a free radical, the unpaired electron will be found on the most electronegative atom.

Hydrogen never has a complete octet.

All chemical compounds with an odd number of electrons are radicals.

Boron is typically satisfied with 4 valence electrons.

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

CHEM 14A Chapter Notes - Chapter 2C.2: Phosphorus Trichloride, Hypervalent Molecule, Noble Gas

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