Periodicity

Question	Answer
Group meaning	OSE
Period	Highest energy level
S/P/D block	Which subshell the highest energy electron(s) in
S/P/D groups	S - 1/2 P - 13->18 D - 3->12
Ionisation energy definition	Energy required to remove one electron from each atom of one mole of gaseous atoms
Factors influencing IE	Charge ^ = IE ^ Radius ^ = IE decrease Shielding ^ = IE decrease
What is shielding	Inner shell electrons repel outer shell electons
Predictions from IE and why	OSE - From IE trends Determine group from OSE
Trends in periodic table	IE ^ across a period (^ charge, smaller radius, same shielding). Decreases down a group (larger radius, more shielding).
Be -> B	Electron in B in a p orbital, higher energy level, therefore less energy must be inputted to reach IE to remove it.
N->O	P orbitals in N are singly occupied Shared pair in O, repel each other, makes it easier to remove.
Trends in mpt across Period 2+3:	Increases across from Group 1->14 Decrease between 14+ 15
Why decrease?	Giant covalent -> simple molecular
Where DON'T these trends continue?	From period 4 onwards the D block elements don't adhere to these rules S and P block elements DO however.

Resource summary

	Created by I Shouldn't be awake over 6 years ago