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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.

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% 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

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