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AS ionisation energy question - help please!

Explain why the general trend is for first ionisation energy to increase across the trend.

It is a 3-mark question and I put that there are more protons and electrons and hence greater force of attraction and got 1 mark for it, && don't know how to get the other 2 marks?

thankssss
Reply 1
Avatar for Malsy
Malsy
18
Basically Ionisation energy: elctrons can be removed from atoms by hitting the atoms with a beam of elctrons. this allows us to measure the energe IT TAKES to REMOVE these electrons. this is called IONISATION ENERGY ...

Normally one elctron is generally easier to move than say removing 2, 3, 4, 5 and so on. the electrons closest to the nucelus tend to be the hardest to remove because they are nearest to the positive charge of the nuclues.

Erm hope that helps a little :o:
nuclear charge - as this increases with proton number ionisation energy will obviously increase

distance between charges - along the period electrons fill into the same shell, but as number of protons increases (greater effective nuclear charge) electrons are pulled in even more - shorter distance = more attraction, harder to remove
Reply 3
Avatar for CCJ
CCJ
14
Nuclear Charge increases
Shielding effect stays the same as electrons/protons added to same shell
Distance decreases

is what they're looking for you to comment on for the 3 marks.

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