Trends of Period 3 Elements: Atomic Radius (AQA A-Level Chemistry): Flashcards
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Atomic radius definition
Atomic radius definition
Distance from nucleus to outermost electron shell
Atomic radius trend across Period 3
Atomic radius trend across Period 3
Decreases
Period 3 element range
Period 3 element range
Sodium () to argon ()
What increases across Period 3?
What increases across Period 3?
Nuclear charge (number of protons)
Effect of increasing nuclear charge
Effect of increasing nuclear charge
Stronger electrostatic attraction on electrons
Number of electron shells in Period 3 elements
Number of electron shells in Period 3 elements
Same (third shell)
Shielding effect across Period 3
Shielding effect across Period 3
No increase
Energy level electrons added to in Period 3
Energy level electrons added to in Period 3
Third shell
Why outer electrons pulled closer in Period 3
Why outer electrons pulled closer in Period 3
Increasing nuclear charge with consistent shielding
Two factors causing radius decrease in Period 3
Two factors causing radius decrease in Period 3
Increasing nuclear charge & same electron shells