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There are two similar but unrelated issues with electron/subatomic particle representation in the chemistry/nuclear checker respectively currently, each breaking certain ways that an answer can be accepted.
Chemistry: Electrons have inherent +1 charge that is not represented as a property. This charge wasn't being counted in
chargeCount
, and so non-exact matching for half-equations was failing.Nuclear: Subatomic particles without mass (e.g. electrons, neutrinos, betaparticles) are sometimes allowed in Content as answers without mass/atomic numbers attached (as well as the same answer WITH the numbers attached). We had been assuming that missing mass/atomic numbers were erroneous, but this has now been disabled for massless particles and instead the values default to correct.