Why atoms bond:
v Noble gases are stable
v Atoms bond to achieve electronic configuration of a noble gas
v Do so by transfer or sharing of electrons with other atoms
v Atom will achieve stability by having an electric configuration of a noble gas
Ø 2 electrons in 1st shell
Ø 8 electrons in 2nd shell
Chemical bonding:
v Ionic bonding
Ø Usually formed between non-metals and metals
Ø Is the electrostatic force of attraction between oppositely charged ions in an ionic compound
Ø Example: sodium chloride
§ Sodium passes one electron to chlorine so that both can achieve a full valence
§ Have opposite charges
§ Attract with each other
§ Forms an ionic bond
v Covalent bonding
Ø Form bonds by sharing electrons to gain electronic configuration of a noble gas
Ø Is a bond formed by the sharing of a pair of electrons
Ø Are generally formed between atoms of non-metal
Ø Can be formed between atoms of same elements or between atoms of different elements
Ø Example: Hydrogen gas
§ Hydrogen atom has 1 valence electron
§ Requires one more electron to obtain the electronic configuration of a noble gas
§ Share a pair of electrons between themselves to form hydrogen molecules
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