2.1 Periodicity Flashcards
1
Q
What are the trends in electrical conductivity in Period 3?
A
Increase Na to Al Decrease Al to Ar Al> Mg> Na as metallically bonded with increased delocalised electrons Si is a semiconductor P,S,Cl,Ar have no delocalised electrons
2
Q
What are the trends in atomic radii in Period 3?
A
Decreases as protons increase
outer electrons in same shell
Stronger pull due to more protons pulling the electrons closer to the nucleus
3
Q
What are the trends in electronegativity in Period 3?
A
Increases as protons increase
smaller atoms
stronger attraction from nucleus to 2 electrons in a covalent bond
4
Q
What are the trends in melting and boiling points in Period 3?
A
Decreases Na, Mg, Al- stronger metallic bonds Si, Giant covalent P,S,Cl- simple molecular with weak van de waals Ar- monoatomic
5
Q
What are the trends in ionisation energy in Period 3?
A
Increases as protons increase
smaller atoms
stronger attraction from nucleus to outer electrons.