Q. Calculate the average atomic mass of Bromine atom. 8. CalCU!åte the average atomic mass of Chlorine atom. 9. Why do Helium , Neon and Argon have zero valency? 10. An element X has a mass number 4 and atomic number 2. Write the valency of this element. 11. In the gold fOil- experiment of Geiger and Marsden, that paved way for Ruther-fords model of an atom, approximately 1.00% of the alpha particles were found to deflect at angles greater than 50 degree. If one mole of alpha particles were bombarded on the gold foil , calculate the nurnber of alpha particles that would deflect at angles less than 50 degree.

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which one are you are asking me to solve.
 
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