Ionisation Energy

Question 1

What is the first ionisation equation for oxygen?

Answer 1

O (g) -> O +(g)+ e-

Question 2

What are the factors affecting ionisation energy and why?

Answer 2

Nuclear charge- more protons the stronger the attraction to electrons

Distance from nucleus-attraction falls off v rapidly. Close to nucleus more attracted than one far away

Shielding- number of electrons between nucleus and outer electrons and nucleus increases lessens pull of nucleus

Question 3

Define second ionisation energy and give the equation for oxygen

Answer 3

The second ionisation energy is the energy needed to remove 1 electron from from each ion in 1 mole of gaseous 1+ ions to form one mole of gaseous 2+ ions

O+(g)->O2+(g)+e-

Question 4

How can you use a graph to tell which group an atoms in?

Answer 4

There will b a jump in ionisation energy

Question 5

Define first ionisation energy

Answer 5

The first ionisation energy is the energy needed to remove one electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions