Electronegativity - bond polarlity in covalent bon
Electronegativity:- is the power of an atom to attract the electron density in a covalent bond towards itself.
Electronegativity depends on:-
- the nuclear charge
- the distance between the nucleus is to the shared outer shell electrons
- the shielding of the nuclear charge by electrons in inner shells
1 of 3
Trends in electronegativity
- As we go up the periodic table, electronegativity increases (atoms get smaller) and there is less shielding by electons in inner shells.
- As we go across the periodic table, electronegtivity increases. Nuclear charge increases but the shielding stays the same, the number of inner main levels remain the same and the atoms become smaller.
- Electroneativity decreases down a group as the numbe of shells increases, so shielding increases and the electrons are less strongly attracted to the atom.
2 of 3
Polarity of covalent bonds
3 of 3