Question

In the Gold foil experiment of Geiger and Marsden, that paved the way for Rutherford’s model of an atom, ~ 1.00% of the α-particles were found to deflect at angles > 50º. If one mole of α-particles were bombarded on the gold foil, compute the number of α-particles that would deflect at angles less than 50⁰.

Answer 1

% of α-particles deflected more than 50⁰ =1% of α-particles. 

% of α-particles deflected less than 50⁰ =100–1 = 99% 

Number of α-particles bombarded = 1 mole = 6.022×10²³ particles 

Number of particles that deflected at an angle less than 50⁰