Electron Arrangements and ionisation energy

Question 1

define ionisation energy

Answer 1

Energy required to removed a mole of electrons from a mole of atoms in the gaseous state and measured in kJ mol-1

Question 2

Trend of removing electrons

Answer 2

First electron needs the least energy to remove it as its being removed from a neutral atom.
Second one needs more energy as being removed from a 1+ ion.
And so on…

Question 3

First, second and third IE of Sodium

Answer 3

Na(g) –> Na+(g) + e- First IE
Na+(g) –> Na2+(g) + e- Second IE
Na2+(g) –> Na3+(g) + e- Third IE

Question 4

Trends in IE across a Period

Answer 4

Generally Increase

Nuclear charge increases making it harder to remove electron.

Question 5

Trends in IE down a Period

Answer 5

Generally Decrease

Nuclear charge increases so actual charge felt by outer electron is less than the full nuclear charge