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**[SOLVED] Nuclear Physics - Mass Defect & Binding Energy**

**1. Carbon 12 ([tex]^{12}_{6}[/tex]C) has a nuclear mass of 1.99264 x 10**

^{-26}kg, a proton has a mass of 1.67353 x 10^{-27}, and a neutron has a mass of 1.67492 x 10^{-27}kg. Calculate the mass defect for carbon 12.My equation looks like this:

[tex]\Delta[/tex]m = [Z(m

_{p}+m

_{e}) + (A-Z)m

_{n}]-m

_{atom}

Where:

[tex]\Delta[/tex]m = ?

m

_{p}= 1.67353 x 10

^{-27}kg

m

_{n}= 1.67353 x 10

^{-27}kg

m

_{e}=

m

_{atom}= 1.99264 x 10

^{-26}

Z = 6

A = 12

What I'm not sure is what m

_{e}is. Could anybody help me?