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you have to think in terms of Atoms..think of pure lead as a box of marbles tightly packed..there are small spaces around each one..if the alloying agent has smaller Atoms..say Tin, Silver, or Antimony..these will fill up spaces around marbles. This new concoction is neather pure Lead, Tin, Silver, or Antimony anymore but a new metal with different melting point, and characteristics. I don't know if I've explaned it right but this is the jist of it.
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