This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
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Sinus Iridum is generally considered to be younger than Mare Smythii. Mare Smythii, which is a large lunar mare, formed earlier in the Moon's history, while Sinus Iridum, a smaller bay of the larger Mare Imbrium, formed later due to volcanic activity. The relative ages can be determined through radiometric dating of lunar samples and analyzing the impact cratering on their surfaces.
8 electrons
16 electrons
20 electrons
97 electrons
4 electrons.
6 electrons
4 electrons, 2 valence electrons
There are 16 electrons in an O2 molecule. Each oxygen atom contributes 8 electrons, totaling 16 electrons in the molecule.
Germanium has 32 electrons.
Xenon has 54 electrons.