Select the correct answer.
This periodic table entry is for the element neon. How many neutrons does a typical neon atom have?
20.18
5
B.
C.
20
D.
30
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This large tectonic plate is bounded on three sides by whats know as the ring of fire. what is the name of this tectonic plate? a) pacific plate b) eurasian plate c) north american plate d) indo- australian plate plz it's science but there's no option for science so i picked chemistry

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule