# Ionisation energies

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#1
' State the general trend in first i.e from carbon to neon.
Deduce the element that deviates from this trend and explain why this element deviates from the trend'

I got one mark for saying an increase
the element which deviates is oxygen and the explanation was 'paired electrons in a 2p orbital so the paired electrons repel'
ik this may sound really stupid but aren't there paired electrons in all the elements from carbon to neon? why is it oxygen and can someone please explain the explanation from the mark scheme to me. thank you
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10 months ago
#2
(Original post by PastelColours)
' State the general trend in first i.e from carbon to neon.
Deduce the element that deviates from this trend and explain why this element deviates from the trend'

I got one mark for saying an increase
the element which deviates is oxygen and the explanation was 'paired electrons in a 2p orbital so the paired electrons repel'
ik this may sound really stupid but aren't there paired electrons in all the elements from carbon to neon? why is it oxygen and can someone please explain the explanation from the mark scheme to me. thank you
Carbon and nitrogen dont have paired electrons in the p-orbital. It is 2p2 and 2p3 respectively. From oxygen, they have paired electrons in p-orbital- 2p4
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#3
(Original post by Exdoz)
Carbon and nitrogen dont have paired electrons in the p-orbital. It is 2p2 and 2p3 respectively. From oxygen, they have paired electrons in p-orbital- 2p4
Thank you but what does it mean by 'paired electrons' thats the bit which is confusing me! sorry to bother you once again x
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10 months ago
#4
(Original post by PastelColours)
Thank you but what does it mean by 'paired electrons' thats the bit which is confusing me! sorry to bother you once again x
Think of it as a bus analogy. If you go on the upper deck and there are some empty seats and some seats where it is free next to other passengers, where will you sit? You will sit where it is empty right- so you wont sit next to the passenger. Same thing for these electrons. As there are 3 p-orbitals, they will fill them up 'single-handedly' before pairing up in the same orbital. So if there are 4 electrons, the first 3 will single handedly fill up the 3 orbitals, and then the last one is forced to go and pair with one of the electrons in the p-orbital. *Orbitals can hold a maximum of 2 electrons at once*
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10 months ago
#5
(Original post by Exdoz)
Think of it as a bus analogy. If you go on the upper deck and there are some empty seats and some seats where it is free next to other passengers, where will you sit? You will sit where it is empty right- so you wont sit next to the passenger. Same thing for these electrons. As there are 3 p-orbitals, they will fill them up 'single-handedly' before pairing up in the same orbital. So if there are 4 electrons, the first 3 will single handedly fill up the 3 orbitals, and then the last one is forced to go and pair with one of the electrons in the p-orbital. *Orbitals can hold a maximum of 2 electrons at once*
And orbitals are filled singularly because electrons repel 1 another as they have the same charge (-ve). Thus meaning it makes sense and the atom is more stable when electrons occupy each orbital singularly first before pairing.
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10 months ago
#6
(Original post by JamesAndrews1)
And orbitals are filled singularly because electrons repel 1 another as they have the same charge (-ve). Thus meaning it makes sense and the atom is more stable when electrons occupy each orbital singularly first before pairing.
I wouldn't say it makes the atom more stable (I haven't learnt that). But you get the idea.
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10 months ago
#7
oxygen is just above sulfur in periodic table
sulfur has paired electrons in its p orbital which means oxygen has it tooo
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#8
(Original post by Exdoz)
Think of it as a bus analogy. If you go on the upper deck and there are some empty seats and some seats where it is free next to other passengers, where will you sit? You will sit where it is empty right- so you wont sit next to the passenger. Same thing for these electrons. As there are 3 p-orbitals, they will fill them up 'single-handedly' before pairing up in the same orbital. So if there are 4 electrons, the first 3 will single handedly fill up the 3 orbitals, and then the last one is forced to go and pair with one of the electrons in the p-orbital. *Orbitals can hold a maximum of 2 electrons at once*
Ah ok that bus analogy works ty so much x
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10 months ago
#9
(Original post by Exdoz)
I wouldn't say it makes the atom more stable (I haven't learnt that). But you get the idea.
It does make the atom more stable. Think about it, if the electrons were paired in an orbital they'd repel 1 another and be removed more easily. Thus the atom would want to release the electron and the reaction that follows will make it more stable. However, singularly paired electrons would make the atom more stable (less reactive)
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10 months ago
#10
(Original post by JamesAndrews1)
It does make the atom more stable. Think about it, if the electrons were paired in an orbital they'd repel 1 another and be removed more easily. Thus the atom would want to release the electron and the reaction that follows will make it more stable. However, singularly paired electrons would make the atom more stable (less reactive)
It would actually be less stable. Because to remove that electron, you would need less energy, due to 'mutual repulsion'- it will have a lower ionisation energy than an element that is close to its atomic number without a paired electron in the p-orbital. As less energy is needed- it is less stable
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10 months ago
#11
(Original post by Exdoz)
It would actually be less stable. Because to remove that electron, you would need less energy, due to 'mutual repulsion'- it will have a lower ionisation energy than an element that is close to its atomic number without a paired electron in the p-orbital. As less energy is needed- it is less stable
Is that not what I said?
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10 months ago
#12
(Original post by JamesAndrews1)
Is that not what I said?
My bad, I thought you said the opposite
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