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 NEW Large TUSH CUSH Orthopedic Ergonomic Seat Cushion Office Desk Task Chair $44.95 Time Remaining: 7d 16h 51m Buy It Now for only: $44.95 |
 Car Cush by Tush Cush Orthopedic Chair Seat Cover Pad Cushion $39.95 Time Remaining: 23d 8h 18m Buy It Now for only: $39.95 |
 Zuo Modern Carbon Chair White $353.63 Time Remaining: 17d 6h 50m Buy It Now for only: $353.63 |
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 Top Line Polycarbonate Chairs Set of 2 Carbon Graphite $289.99 Time Remaining: 4d 18h 51m Buy It Now for only: $289.99 |
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 NIB NEW Herman Miller Aeron Basic Graphite Frame Chair Carbon Mesh Small Size A $679.00 Time Remaining: 11d 21h 43m Buy It Now for only: $679.00 |
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 NEW NIB Herman Miller Embody Ergonomic Computer Task Home Office Desk Chair $1,399.00 Time Remaining: 11d 13h 17m Buy It Now for only: $1,399.00 |
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 Herman Miller Aeron Adjustable Posture Fit Chair Size C $889.00 Time Remaining: 11d 22h 37m Buy It Now for only: $889.00 |
 Herman Miller Aeron Adjustable Posture Fit Chair Size B $889.00 Time Remaining: 11d 22h 35m Buy It Now for only: $889.00 |
 Herman Miller Embody Ergonomic Computer Office Chair Graphite Carbon Balance NEW $1,429.00 Time Remaining: 28d 23h 15m Buy It Now for only: $1,429.00 |
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 Aeron Herman Miller Desk Ergonomic Computer Office Task Chair Graphite Carbon $869.00 Time Remaining: 6d 11h 56m Buy It Now for only: $869.00 |
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 12 YEAR WARRANTY Herman Miller Aeron Adjustable Lumbar Pad Chair Small Size A $849.00 Time Remaining: 11d 22h 11m Buy It Now for only: $849.00 |
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 Zuo Modern Carbon Chair Black $353.63 Time Remaining: 17d 3h 13m Buy It Now for only: $353.63 |
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Atoms and Chemistry...?
1. What element results if one of the neutrons in a nitrogen nucleus is converted by radioactive decay into a proton?
2. The atoms that constitute your body are mostly empty space, and structures such as the chair you're sitting on are composed of atoms that are mostly empty space. So why don't you fall through the chair?
3. If an atom has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass? What is the name of theis element?
4. Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13?
Ha ha... you're funny!
No, I need a little shove in the right direction. Maybe someone knows of a website that has more info. than my book has...
1. An element is defined by the number of protons in its nucleus. The number of neutrons is completely irrelevant (atoms with different number of neutrons, but the same number of protons, are isotopes of the same element). So ask yourself these questions: How many protons does a nitrogen atom have? Which element has one more proton than nitrogen?
2. Electrostatic repulsion (forces between interacting molecules). I'll let you look up the details.
3. The approximate mass, in amu, is the number of neutrons plus the number of protons. Since you only want an approximation, don't worry about the electrons, which weigh 1000 times less than protons and neutrons. For the name of the element, remember what I said in question #1.
4. The molecular weight of C-12 is 12 g/mol. So 1 g of C-12 contains 1/12 moles C-12. Likewise, 1 g of C-13 contains 1/13 moles C-13. And you also know that the number of atoms in a mole is always the same (Avogadro's number), so which of the above has more atoms?
Air Chair Carbon Lightweight Ski Blank Test #1