The more available the electrons, the more readily they can be donated to form a new bond to the proton and, and therefore the stronger base.
Factors governing basicity:
Electronegativity. When comparing atoms within the same row of the periodic table, the more electronegative the atom donating the electrons is, the less willing it is to share those electrons with a proton, so the weaker the base.
Size. When comparing atoms within the same group of the periodic table, the larger the atom the weaker the H-X bond and the lower the electron density making it a weaker base.
Resonance. Delocalization of electrons decreases charge density which makes it a weaker base.
Rank the following compounds in increasing order of basicity.
pyrrole water ammonia hydroxide pyridine
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