Helium has 2 protons, 2 neutrons, and 2 electrons ...
2 Answers · Education & Reference · 07/11/2011
*to the tune of jingle bells* Helium Helium It is number 2. H and E make...
2 Answers · Entertainment & Music · 15/10/2011
Helium is colourless and odourless. It is ...
2 Answers · Science & Mathematics · 24/01/2009
Helium - 2 protons 10 heliums - 20 protons 1 proton has charge 1.6E-19C Multiply by 20.
1 Answers · Science & Mathematics · 05/05/2009
Sorry, but most teachers would consider this cheating :-P
2 Answers · Science & Mathematics · 19/05/2011
I think superfluid helium is cool (heh - no pun intended). I think the article you want perspective on is missing.
2 Answers · Science & Mathematics · 09/03/2009
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
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
...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
...1* 10 ^-6 mole x = 6.02* 10 ^17 atoms in 1 micromole. ========== 1 mole of helium = 6.02* 10 ^23 atoms x mole = 1.25 * 10 ^20 1. 25* 10 ^20 = 6.02* 10 ^23 x x = 1.25* 10 ...
2 Answers · Science & Mathematics · 31/01/2010