The element of the second period forms compounds of the type X n E − E X n , where X can be Hydrogen or a halogen. Possible Lewis structures for B 2 F 4 , C 2 H 4 , N 2 H 4 a n d O 2 H 2 should be drawn. Hybridization of second group elements in this molecules and the approximate X − E − E bond angle should be determined. Concept Introduction: Lewis structures are diagrams that represent the chemical bonding of covalently bonded molecules and coordination compounds. It is also known as Lewis dot structures which represent the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule. The Lewis structure is based on the concept of the octet rule so that the electrons shared in each atom should have 8 electrons in its outer shell. Hybridization is the mixing of valence atomic orbitals to get equivalent hybridized orbitals that having similar characteristics and energy. T y p e o f m o l e c u l e H y b r i d a i z a t i o n A t o m i c o r b i t a l s u s e d f o r h y b r i d a i z a t i o n G e o m e t r y A X 2 s p 1 s + 1 p L i n e a r A X 3 , A X 2 B s p 2 1 s + 2 p T r i g o n a l p l a n a r A X 4 , A X 3 B , A X 2 B 2 s p 3 1 s + 3 p T e t r a h e d r a l A X 5 , A X 4 B , A X 3 B 2 , A X 2 B 3 s p 3 d 1 s + 3 p + 1 d T r i g o n a l b i p y r a m i d a l A X 6 , A X 5 B , A X 4 B 2 s p 3 d 2 1 s + 3 p + 2 d O c t a h e d r a l A → C e n t r a l a t o m X → A t o m s b o n d e d t o A B → N o n b o n d i n g e l e c t r o n p a i r s o n A T y p e o f m o l e c u l e H y b r i d a i z a t i o n G e o m e t r y B o n d a n g l e A X 2 s p L i n e a r 180 ° A X 3 , A X 2 B s p 2 T r i g o n a l p l a n a r 120 ° A X 4 , A X 3 B , A X 2 B 2 s p 3 T e t r a h e d r a l 109.5 ° A X 5 , A X 4 B , A X 3 B 2 , A X 2 B 3 s p 3 d T r i g o n a l b i p y r a m i d a l 120 ° , 90 ° A X 6 , A X 5 B , A X 4 B 2 s p 3 d 2 O c t a h e d r a l 90 ° A → C e n t r a l a t o m X → A t o m s b o n d e d t o A B → N o n b o n d i n g e l e c t r o n p a i r s o n A

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Chapter 9, Problem 50GQ

Interpretation Introduction

Interpretation:

The element of the second period forms compounds of the type XnE−EXn, where X can be Hydrogen or a halogen. Possible Lewis structures for B2F4,C2H4,N2H4 and O2H2 should be drawn. Hybridization of second group elements in this molecules and the approximate X−E−E bond angle should be determined.

Concept Introduction:

Lewis structures are diagrams that represent the chemical bonding of covalently bonded molecules and coordination compounds.

It is also known as Lewis dot structures which represent the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

The Lewis structure is based on the concept of the octet rule so that the electrons shared in each atom should have 8 electrons in its outer shell.

Hybridization is the mixing of valence atomic orbitals to get equivalent hybridized orbitals that having similar characteristics and energy.

Type of moleculeHybridaization Atomic orbitals used for hybridaization GeometryAX2sp1s+1pLinearAX3,AX2Bsp21s+2pTrigonal planarAX4,AX3B,AX2B2sp31s+3pTetrahedralAX5,AX4B,AX3B2,AX2B3sp3d1s+3p+1dTrigonal bipyramidalAX6,AX5B,AX4B2sp3d21s+3p+2dOctahedralA → Central atomX → Atoms bonded to AB → Non bonding electron pairs on A

Type of moleculeHybridaizationGeometryBond angleAX2spLinear180°AX3,AX2Bsp2Trigonal planar120°AX4,AX3B,AX2B2sp3Tetrahedral109.5°AX5,AX4B,AX3B2,AX2B3sp3dTrigonal bipyramidal120°,90°AX6,AX5B,AX4B2sp3d2Octahedral90°A → Central atomX → Atoms bonded to AB → Non bonding electron pairs on A

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