ATOMIC BONDING Atomic Bonding
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1 ATOMIC BONDING Atomic Bonding Primary Bonds Secondary Bonds Ionic Covalent Metallic van der Waals
2 1. IONIC BONDING q 11 Na & 17 Cl These two ions are attracted to eachother by the electrostatic force developed b/w them and an ionic compound (NaCl) forms. q The ionic bonding b/w the two atoms results from the transfer of an electron from an electropositive atom to an electronegative one, so a strong electrostatic attraction is set up b/ w the ions.
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5 Ionic Bonds are nondirectional! Cation Coulombic interaction Anion Note the relative sizes of ions Na + shrinks and Cl - expands Cl - Na+
6 Properties of Ionic Bonding 1. Force of attraction is electrostatic (coulombic) 2. Bond is non-directional (each + ion is surrounded by as many ions as possible) 3. Bond is strong, stable, brittle 4. High melting point (as the # of e - involved in the bond increases, melting point increases) 5. Poor electrical conductivity 6. Forms between atoms of different electronegativity values (one high, one low). An obvious limitation is that it can form only b/w different atoms.
7 2. COVALENT BONDING q Covalent bond is the bond in which e - are shared b/w atoms. The elements showing covalent bond obey (8-N) rule. q (8-N) rule: The number of the closest neighbors to each atom is equal to (8-N) N is the valance e -. q When N=7, such as Cl 8-7=1 the atoms pair off as diatomic molecules. Cl + Cl Cl Cl
8 q When N=6 such as S 16 S : 1s2 2s 2 2p 6 3s 2 3p =2 v each atom has two closest neighbors so they form long chains. S S O, Se, Te behave like S. S S
9 q When N=5, such as 33 As : 1s2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 3 8-5=3 They require 3 closest neighbors so they form sheets of atoms. q When N=4, such as 6 C : 1s 2 2s 2 2p 2 8-4=4 They form 3-D structures.
10 Ethylene molecule
11 Properties of Covalent Bonding 1. It is based on electron sharing. 2. Bond is directional (each atom is surrounded by a definite amount of other atoms) 3. Bond is hard and strong (slightly less than ionic) 4. Very high melting point. 5. Poor electrical conductivity. 6. Forms b/w atoms with high electronegativity. Covalent bonding is not limited to elements; many compounds are covalent, like HCl, H 2 O.
12 3. METALLIC BONDING q Covalent bonding occurs in electronegative atoms where they want to give away electrons. q Metallic bond can be considered as a special type of covalent bond in which instead of sharing particular valance electrons, general sharing of valance e - is responsible for the bond. q Valance electrons are detached from atoms, and spread in an electron cloud that holds the ions together.
13 q The positive metal ions are arranged regularly in a crystal lattice and a cloud of valance electrons surround them. Electron cloud Metal ions
14 Properties of Metallic Bond 1. It is based on electron sharing. Electrons are shared among all atoms. 2. Non directionality - desire for the largest number of nearest neighbors. 3. High thermal and electrical conductivity. 4. Moderately lower melting point. 5. Weakest primary bond. 6. Forms between atoms with low electronegativity.
15 High thermal and electrical conductivity? Since the valance e - are not bound to any particular atom, they can move through the lattice under the application of an electric potential causing a current flow. Also by a series of collisions with neighboring electrons they transmit thermal energy rapidly through the lattice.
16 SECONDARY BONDS (VAN DER WAALS BONDS) q Secondary bonds are universal to all atoms and molecules, but as it is a very weak bond, it may be neglected when primary bonds exist. q It can also be termed as a physical bond as opposite to chemical bonding that involves e - transfer. q Describes a dipolar attraction b/w neutral atoms.
17 q Since electrons move around nucleus (electronic charge is in motion), it is possible for electrons to be located unsymmetrically with respect to nucleus at a moment. q In this way a dipole will be formed. q Van der Waals bonding is a result of an attraction b/w opposite poles of these dipoles. Dipole: Pair of equal and opposite electric charges.
18 Ex: HYDROGEN BOND q As the valance electrons of water molecule spend more of its time around Oxygen atom than the Hydrogen atom, a dipole is formed. q The oxygen end of the molecule develops a partial negative charge (because of the negative charge on the electrons). q For the same reason, the hydrogen end of the molecule develops a partial positive charge. q Negative end of each water molecule is attracted by a positive end of another water molecule. q Ions are not formed; however, the molecule develops a partial electrical charge across it called a dipole.
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21 n Metals: Metallic bond n Ceramics: Ionic / Covalent bonds n Polymers: Covalent and Secondary bonds n Semiconductors: Covalent or ovalent / Ionic bonds
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