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Add them all together and divide by the amount of numbers so:

220 + 256 + 258+ 240 = 974

974 divided by 4 = 243.5

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Q: What is the average of 220 256 258 240?
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It is 287.


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The difference between mendelevium-256 and mendelevium-258 lies in their atomic mass, with mendelevium-256 having 256 nucleons (protons and neutrons) and mendelevium-258 having 258 nucleons. This means that mendelevium-258 has two more neutrons in its nucleus compared to mendelevium-256.


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