Periodicity

Periodicity ( Period 3 )

• Periodicity is the repeating patterns in the physical and chemical properties of the elements across the periods of the Periodic Table.
• 1. Atomic radii 2. Ionic radii 3. Electrical conductivity 4. First ionisation energies

Atomic radii

• 
• Atomic radius decreases across a period
• Nuclear charge increases
• Shielding effect remains roughly constant
• Greater attractive force is exerted on the valence shell electrons which pulls electrons in closer to the nucleus

Ionic radii

• 
• From Na(+1) to Si(+4), the ionic radius decreases due to increasing nuclear charge, constant shielding effect, which attracts the outer shell electrons closer towards the nucleus.
• From P(-3) and Cl(-1) , the anions