Daughter has reached the age of asking "why?" to everything.
"hold on to that cup with both hands"
"i don't want you to drop it"
"It's made of glass, and if you drop a glass thing it can break"
"because glass is brittle"
"because supercooling molten silicon dioxide makes an amorphous solid which is weaker than the crystalline form"
"the crystalline form has a tetrahedral lattice of ionic bonds"
"because one silicon atom can bind with four oxygen"
@jacek i can go one level deeper which is "the Pauli exclusion principle says every electron must have distinct quantum states, so the number of electrons in each shell is determined by how many states there are for quantum numbers"
but after that if she asks "why" again I have to say "I don't know!"
I think it's kinda cool how it only takes about 8 or 9 "why"s to reach the limits of human knowledge
@nindokag There are a some whys in between I thing, there are quantum solutions that define shape of electron orbitals. But I was never super good at physical chemistry, so no more details here.
after a couple more whys the answer should be 'we assume this as a postulate' which is followed by 'because its implications agree with everything that can be observed'. After that the anwers can go into the other direction in an endless circle, listing all phenomena verifying the postulate.
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