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Anon describes experience (lemmy.ml)
submitted 1 year ago by to c/greentext@sh.itjust.works
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[–] 194 points 1 year ago (17 children)

That, and teachers really fucking hate being called out on something for some reason.

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  • [–] 79 points 1 year ago (13 children)

    All my teachers were fine with it honestly :3 at least after primary school.. if you corrected them they might've given you extra credit

    But the general notion of saying something correct and people saying that that's wrong, and not knowing why still stands

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  • [–] 34 points 1 year ago* (9 children)

    I asked my science teacher why and how the periodic table was setup like it was, I got "that's how it's setup"

    But why, there as to be a reason

    That's just the way they made it

    Yeah because they have to have gone by something what is that something

    That's just the way they did, stop asking questions (please don't fucking learn in here)

    Godamn that pissed me off.

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  • [–] 19 points 1 year ago (6 children)

    Really? We got a detailed breakdown of why the periodic table is the way it is

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  • [–] 12 points 1 year ago (5 children)

    Yeah, turned me off to science at that age too which sucks because I was pretty into it.

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  • [–] 6 points 1 year ago (4 children)

    in case you still care: the periodic table is arranged primarily by the chemical properties of its elements (mainly electronegativity, i.e. how much energy it takes to add/remove an electron to/from the atom) and also by their mass.

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  • [–] 4 points 1 year ago (2 children)

    Huh? It's sorted by number of electrons/protons (atomic number) the mass is dependent on that and the number of neutrons.

    The eight main groups are based on the number of electrons missing for the atom to reach a full valence shell. Once it is full (8th group, noble gasses) it starts a new Period (row). I'm not sure how the other groups are chosen (probably some quantum physics that I never had in chemistry class). After looking it up Wikipedia says it just keeps going that way.

    Electronegativity describes how much it "wants" to attract negative charges and doesn't affect the order (Flourine has the highest and is in group 7). I think you may have confused it with ionization energy which would certainly match my understanding of the top half of the periodic table and probably does work for the lower half too now that I think about it.

    The groups tend to have similar properties but that is not why they are sorted that way. Hydrogen for example is quite different from other elements in group one. The colours are probably better for finding common properties.

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  • [–] 6 points 1 year ago (1 child)

    Have a look through the history section. The concept of periodicity substantially predates the quantisation of the atom. The modern table certainly considers atomic orbitals to be key, but the groups were absolutely created based on common properties.

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  • [–] 6 points 1 year ago

    The table that does it that way is a complete mess but I guess it was a good idea and got some things right.

    They first started doing it with valence shells in 1864, Mendeleev had a pretty close one based on atomic weights in 1871 and correctly predicted that there were missing elements based on valences + weights. The atomic numbers which determine the valences appear to have been discovered about 40 years later.

    I guess you are correct but I think the question was about the modern table.

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  • [–] 4 points 1 year ago (1 child)

    Too proud to say "I don't know, I'll look it up and tell you tomorrow".

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  • [–] 4 points 1 year ago

    Yeah, that wouldve been a great opportunity to get me further interested.

    I have never been in a job where "I don't know" is an acceptable answer, but I've always been in a job where "I don't know, but I can find out for you" always is.

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