Match the time frame listed on the left with the characteristic listed on the right.
Mesozoic era
?
Age of the dinosaurs
End of the
Mesozoic era
?
Most of Earth a desert
?
A layer of iridium
deposited all over Earth
End of the
Paleozoic era

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.

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