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8/3/2019 chemicalbonds-110503080828-phpapp01
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FORMATION OF
COMPOUNDS
Atom of noble gas achieved the stable electronarrangement (duplet or octet).
They do no need to donate, accept or sharingelectron with other atoms. Thus cannot react with
other atoms.
Electron arrangement of
neon : 2.8 (octet)
Electron arrangement
of Helium : 2 du let
The Atoms are not achieved the stable electronarrangement (duplet or octet) .
Atom should donate, accept or share electron withother atoms to achieved stable electron
arrangement and react to form ionic or covalent
compound.
Why atom of others
elements are not stable?
Why inert gases are
stable?
CHEMICAL BONDSIONIC BONDS COVALENTL BONDS
Formed by transfer of
electrons from metal atom to
non-metal
Metal
(Group 1,2,13)
Negative ions
anion
Attracted by strong
electrostatic forcePositive ions
(cation)
Conduct electricity
in molten
High melting and
boiling points
Covalent compounds
Non-metal atoms share electron to achieve stable octet
electron arrangement
Not conduct
electricit
Non metal
(Group 15,16,17)
Ionic compounds
Formed by sharing of electrons between non-metals
Low melting points
Formed through Formed through
Donate electron Accept electron Pull together by
Weak Van Der Waals forces
8/3/2019 chemicalbonds-110503080828-phpapp01
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Draw the diagram of the formation of sodium chloride, NaCl
Atom Magnesium has 2 valence electron and atom Cl has 7valence electron
Electron arrangement of magnesium atom is 2.8.2 Magnesium atom donate two electron to two atom chlorine
form magnesium ion, Mg2+ and achieve a stable octet electronarrangement.
Electron arrangement of Chlorine atom is 2.8.7 Each chlorine atom accept one electron from magnesium atom
to form chloride ion, Cl- and achieve the stable octet electron
arrangement.
The magnesium ion, Mg2+ and chloride ion, Cl- are attracted toeach other with strong attraction force to form ionic
compound, Magnesium chloride MgCl2
+ -
2+ --
Mg Mg2+ + 2e
Cl + e Cl-
Sodium ion, Na+ and chloride ion, Cl- are attracted to each
other with strong attraction force to form sodium chloride
compound, NaCl
Accept one electronDonate one electron
Atom
(Neutral)Positive ion (cation) Negative ions (anion)
Donate electron
Charge of 11 protons = +11
Charge of 11 electrons = -11
Total charge = 0
Charge of 11 protons = +11
Charge of 10 electrons = -10
Total charge = +1
2.8.12.8
to achieve the stable
octet electron
NaCl
Electron arrangement2.8.1 2.8.7
Na Cl
2.82.8
Charge of 17 protons = +17
Charge of 18 electrons = -18
Total charge = -1
Charge of 17 protons = +17
Charge of 17 electrons = -17
Total charge = 0
2.8.7 2.8.8
accept electron
+ -
Formation of Sodium Chloride Formation of Magnesium Chloride
Donate electron accept electron
Sodium ions , Na+ Sodium atom, Na Chlorine atom, Cl Chlorine atom, Cl-