281Carbon-14, used in radiocarbon dating, has how many protons in its nucleus, just like ordinary carbon?
282An ion is formed when a neutral atom gains or loses which subatomic particle?
283A positively charged ion, formed when an atom loses electrons, is called what?
284A negatively charged ion, formed when an atom gains electrons, is called what?
285When a sodium atom loses one electron to form an ion, what is the resulting charge on the sodium ion?
286When a chlorine atom gains one electron to form an ion, what is the resulting charge on the chloride ion?
287Which metal element forms the central atom of the chlorophyll molecule in green plants?
288Which metal element forms the central atom of the hemoglobin molecule in human blood?
289Nitrogen gas makes up approximately what percentage of Earth’s atmosphere by volume?
290Oxygen gas makes up approximately what percentage of Earth’s atmosphere by volume?
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