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Calcium is most likely to lose two electrons to form its dipositive ion.
Abnormal paps almost never mean HIV. While women with HIV are more likely to have abnormal pap smears, most women with abnormal pap smears do not have HIV.
In the cell's protein formation.
It's most likely that the calcium carbonate in chalk is actually gypsum.
Fluorine and oxygen
Deserts are a biome.
Calcium. I know because I studied chemistry.
If CaCO3 (calcium carbonate) were to decompose, it would likely result in CaO (calcium oxide) and CO2 (carbon dioxide).
Sodium
lose two elcetrons
Most of the nonmetals, particularly the halides.
Seizures involve abnormal electrical impulses of the brain. There are likely other conditions related to abnormal electrical impulses. For instance, people who get migraines often show abnormalities on EEG as well.