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The mass of the protons + the mass of the neutron

charge of protons

mass of proton = 1.67x10-27

mass of neutron = 1.67x10-27

charge of proton = 1.6x10-19

Lead has a nucleon number of 207, and atomic number of 82. Therefore there are 82 protons and (207 - 82) 125 neutrons.

mass of ALL protons = 82 x 1.67x10-27 = 1.3694 x 10-25

mass of ALL neutrons = 125 x 1.67x10-27 = 2.0875 x 10-25

charge of ALL protons = 82 x 1.6x10-19 = 1.312 x 10-17

Put into the equation:

1.3694x10-25 + 2.0875x10-25

1.312x10-17

= 2.63 x 10-8 CKg-1

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