How many atoms are in a 10.4 g sample of Na?
486246
I don't remember the atomic weight of Sodium offhand so I can't give you the exact answer but here's how to figure it out:\n\nDivide 10.4 by the atomic weight of Na (see the periodic table).  That will give you the number of moles of Na in 10.4 g.\n\nMultiply that number by Avogadro's number (6.023 x 10^23) to get the number of atoms.
952552
assume 10^11 stars in 10^11 galaxies at 2x10^33 grams each per star and ~4.6x10^23 atoms/gram (remember, the uni is 10% helium).  This'll get you within an order of magnitude or so.\n\nNote that this is number of ATOMS which appear to represent perhaps only about 5% of the total mass of the universe, most of the rest being dark matter (25%) and dark energy (~70%).
885637
I'll help you..this is weird because I just asked this same question and did this for my chemistry homework online also...I wonder if we're in the same class.\n\n3 862.8 nanometers- thats the answer, but you're going to write\n3.9 x 10^3 nm in the box.\n\nI actually think that we go to the same school...csu stan? probably..well good luck.
767025
The atomic number of Helium is Two and its mass number is 4.\nPROTONS:2\nNEUTRONS:2\nELECTRONS:2\n\nThe atomic number of Gold is 79 and its mass number is 197.\nPROTONS:79\nNEUTRONS:118\nELECTRONS:79
185724
If by NA u mean nucleic acids & Na, sodium:\nNA consists of both covalent & hydrogen bonds while Na wil have metallic bonds. \n\npls correct me if i'm wrong as far as denoting NA & Na. Thanks
309704
Approximately 193,000 atoms thick
1058444
Mg2+ < Na+ < Br-\n\nIon size depends first on the main quantum number. Na and Mg both strip down to the Ne configuration, while Br takes up the Xe configuration, two main quantum numbers higher.\n\nMg2+ is smaller than Na1+ because the remaining electrons are subject to a stronger electrostatic field.\n\nThe above is true for ions in crystal lattices.\n\nNote that in watery solutions ion size has to be calculated differently when you take the hydrate shell into account. Na+ becomes Na(H2O)6(1+), and Mg2+ becomes Mg(H2O)6(2+). Bromide won't take up a regular hydrate shell.
699126
There are 118 elements on the Periodic Table.
145956
MY ANSWER IS :\n\n18.2g  of Na2S is produced.
784949
Additional information is needed.  The mixture could contain one atom of Potassium and the rest Sodium or the reverse.\n\nThe total mass of the sample does not tell you anything about the relative mix.
703295
A mole of ANYTHING contains Avogadro's number of particles, which is 6.02x10^23 of them.  So if 1 mol of gold =6.02x10^23, then 3.21 mol of gold will have: 3.21mol x (6.022x10^23 atoms/mol)=...atoms of gold
749219
a) Ag2S\nb) SnCl4\nc) Na3N\nd) SrI2\n\nDo us a favor and pay attention during class. That way you'd know how to do these.
328717
Na =sodium\nN = nitrogen\n0 = oxygen\n\ntry this:\nhttp://www.webelements.com/
776531
8 protons, 8 neutrons, 10 electrons
716710
1 mole of anything has 6.02x10^23 items...kinda like 1 dozen of anything has 12 items in it\n\nso....1 mole of Li would have  6.20x10^23  atoms\n\n3.66 moles of LIthim x 6.20x10^23 = 2.205 X 10^24 atoms
820564
Sodium has an Atomic Number of 11 and an Mass Number of 23 \n\nThis means an atom of Sodium has 11 Protons and therefore 11 electrons. \n\nSince the number of Protons + Neutrons is 23 and there are 11 Protons there must be 12 Neutrons
752020
A: 53\nB: Approx. 127 AMU\nC:  Atomic Number\n\nThe Element is Iodine by the way.