Ionisation Energies

HideShow resource information
Factors which affect trends in ionisation energy
Atomic Radius, Nuclear charge, Shielding by inner electrons
1 of 6
Down a group
DECREASES DOWN A GROUP (Atomic radius increases / Shielding increases... so less energy required to remove the electron.)
2 of 6
Across a period
INCREASES ACROSS A PERIOD (Atomic radius decreases / Nuclear charge increases / No change in Shielding... So less energy required to remove the electron.)
3 of 6
Group 3
Ionisation energies lower than expected due to the atoms having a s2/p1 arrangement. Outer electron in p1 sub-shell is further from the nucleus aswell as being shielded by inner s2 electrons. Therefore, less energy is required to remove p1 electron.
4 of 6
Group 6
Ionisation energies lower than expected due to electron pairs in the p sub-shell. P4 arrangement creates repulsion between the 2 electrons in same p orbital - so less energy required to remove it.
5 of 6
Defintion of ionisation energy
The energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous 1+ ions.
6 of 6

Other cards in this set

Card 2

Front

DECREASES DOWN A GROUP (Atomic radius increases / Shielding increases... so less energy required to remove the electron.)

Back

Down a group

Card 3

Front

INCREASES ACROSS A PERIOD (Atomic radius decreases / Nuclear charge increases / No change in Shielding... So less energy required to remove the electron.)

Back

Preview of the back of card 3

Card 4

Front

Ionisation energies lower than expected due to the atoms having a s2/p1 arrangement. Outer electron in p1 sub-shell is further from the nucleus aswell as being shielded by inner s2 electrons. Therefore, less energy is required to remove p1 electron.

Back

Preview of the back of card 4

Card 5

Front

Ionisation energies lower than expected due to electron pairs in the p sub-shell. P4 arrangement creates repulsion between the 2 electrons in same p orbital - so less energy required to remove it.

Back

Preview of the back of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Ionisation Energies resources »