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The radius of krypton is 110 picometers, which is 220 picometers diameter, or the length we want of the Kr atom. So, convert

3.5 millimeters (10^9/10^3)

= 3500000 picometers/220 picometers

= 15,909 atoms of Krypton

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12y ago
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9y ago

If the covalent diameter of krypton is 232 pm 7 mm is 30.106 atoms.

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10y ago

3.1*10^-23

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13y ago

15

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Q: How many krypton atoms would have to be lined up to span 3.5mm?
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