How do you know if an element exists diatomically for Edexcel iGCSE?

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OMDawg88
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I am doing a practice paper and just incorrectly answered a question in which I had to write the chemical equation to make ammonia. I did not know that nitrogen is a diatomic molecule, and it did not say in the question.
How do you know if an element exists diatomically? I know that hydrogen, oxygen, halogens and some others do, but is there a rule?
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TriplexA
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(Original post by OMDawg88)
I am doing a practice paper and just incorrectly answered a question in which I had to write the chemical equation to make ammonia. I did not know that nitrogen is a diatomic molecule, and it did not say in the question.
How do you know if an element exists diatomically? I know that hydrogen, oxygen, halogens and some others do, but is there a rule?
Group 7 elements are usually diatomic i.e. Cl2, Br2, I2
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SagaciousSag
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Hydrogen, oxygen, Group 7 and nitrogen are the ones you need to know. Nitrogen has a triple covalent bond.
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OMDawg88
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(Original post by TriplexA)
Group 7 elements are usually diatomic i.e. Cl2, Br2, I2
Yes (halogens as I said) but so is nitrogen, oxygen etc. Is there a rule or do I just memorise them? Thanks for answering.
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OMDawg88
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Ok thanks. I'll just learn them.

(Original post by SagaciousSag)
Hydrogen, oxygen, Group 7 and nitrogen are the ones you need to know. Nitrogen has a triple covalent bond.
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melancollege
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(Original post by OMDawg88)
Yes (halogens as I said) but so is nitrogen, oxygen etc. Is there a rule or do I just memorise them? Thanks for answering.
There are rules and explanations as to why certain ones are diatomic, but it's honestly easier just to learn them for GCSE as the explanations are no easier to learn at this level
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bl0bf1sh
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a webpage (amongst many) giving a decent overview:
https://chemistrytalk.org/diatomic-elements/

it's something you just remember
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JA03
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(Original post by OMDawg88)
I am doing a practice paper and just incorrectly answered a question in which I had to write the chemical equation to make ammonia. I did not know that nitrogen is a diatomic molecule, and it did not say in the question.
How do you know if an element exists diatomically? I know that hydrogen, oxygen, halogens and some others do, but is there a rule?
There’s no general rule, you just have to remember that H, N, O, Cl, F, Br and I are all diatomic.

edit: its all the main halogens i.e iodine, bromine, chlorine, fluorine. then remember its nitrogen, oxygen and hydrogen too. it almost makes an upside down L shape on the periodic table if that helps.
Last edited by JA03; 1 month ago
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