3.2.1 Periodicity Flashcards
1
Q
Why are the Van der Waals’ forces in liquid argon very weak?
A
Argon particles are single atoms with electrons close to nucleus
Cannot easily be polarised
2
Q
Explain the meaning of periodicity
A
Pattern in the change in the properties of a row of elements
Repeated in next row
3
Q
General trend in conductivity (Na-Ar)
A
Decrease
Na-Al metals so electrons free to move
Si-Ar non-metals electrons unable to move
4
Q
Why does atomic radius increase down a group
A
Electron shell added with each increment
Increased distance between outer electrons and nucleus + more electron shielding
Reduced power of attraction
