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  1. Helium has 2 protons, 2 neutrons, and 2 electrons ...

    2 Answers · Education & Reference · 07/11/2011

  2. Helium is colourless and odourless. It is ...

    2 Answers · Science & Mathematics · 24/01/2009

  3. *to the tune of jingle bells* Helium Helium It is number 2. H and E make...

    2 Answers · Entertainment & Music · 15/10/2011

  4. ...5.91* 10 ^6 L)/(302.15 K)(0.08206 L*atm/mol*k^-1) n = 2.43 * 10 ^5 mol The molar mass of helium is 4.003 g/mol, so use this to convert the mols of helium into ...

    1 Answers · Science & Mathematics · 28/10/2011

  5. ... gas undergoes an alpha-decay, i.e per decaying radon atom one helium atom is formed: ²¹⁰Rn → ²⁰⁶Po + ⁴He...

    2 Answers · Science & Mathematics · 22/06/2011

  6. symbol He atomic mass 4 2 neutrons 2 electrons 2 protons atomic number 2 low density low boiling point and melting point raises the pitch of the voice does not react with any other element forms no compounds column 18...

    3 Answers · Science & Mathematics · 18/02/2011

  7. Helium - 2 protons 10 heliums - 20 protons 1 proton has charge 1.6E-19C Multiply by 20.

    1 Answers · Science & Mathematics · 05/05/2009

  8. ...1785kg/m³@0°C and the density of air: 1.2754kg/m³@0°C 10 m³ helium weighs 1.785kg 10 m³ air weighs 12.754 kg 12.754kg (air...

    1 Answers · Science & Mathematics · 26/10/2013

  9. Follow Graham's law of diffusion.square root of M2/M1=t2/t1 M1=4(He),t1= 10 ;M2=16(CH4);t2=? substitue the values and calculate the answer is 20 sec

    1 Answers · Science & Mathematics · 14/11/2013

  10. ... of helium 1 helium atom has 2 eletrons 1 mole of helium will have 2 * 6.023 * 10 ^23 = 1.2046 * 10 ^24 electrons 250 moles of helium will have 250...

    1 Answers · Science & Mathematics · 16/04/2010

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