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Q.

The atomic mass and atomic number of lead are 208 and 82. The atomic mass and atomic number of bismuth are 209 and 83. The neutron/proton ratio in an atom

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a

Is higher in lead than in bismuth

b

Is lower in lead than in bismuth

c

Is equal in both lead and bismuth 

d

None of these

answer is D.

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Detailed Solution

 82Pb208;p=82;n=20882=126 83Bi209;p=83;n=20983=126n/p for Pb=12682=1.53n/p for Bi=12683=1.51np for Pb>np for Bi. 

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The atomic mass and atomic number of lead are 208 and 82. The atomic mass and atomic number of bismuth are 209 and 83. The neutron/proton ratio in an atom