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**1. For astatine 21885At (atomic mass = 218.008684 u) obtain each of the following:**

(a) The mass defect in atomic mass units

wrong check mark u

(b) the binding energy (in MeV)

MeV

(c) the binding energy per nucleon (in MeV)

MeV

(a) The mass defect in atomic mass units

wrong check mark u

(b) the binding energy (in MeV)

MeV

(c) the binding energy per nucleon (in MeV)

MeV

**2. Shown in atempt**

**3. ok, I don't see how I'm wrong here:**

A.)

218 - 85 = 133 = # of neutrons

85(1.6726 x 10^-27 Kg) + 133(1.6749 x 10^-27 Kg) = 3.649327 x 10^-25 Kg

(3.649327 x 10^-25 Kg) / (1.6605 x 10^-27 Kg) = 219.772779 u

219.772779 u -218.008684 u = 1.764095 u.

This is not correct. What am I doing wrong?

A.)

218 - 85 = 133 = # of neutrons

85(1.6726 x 10^-27 Kg) + 133(1.6749 x 10^-27 Kg) = 3.649327 x 10^-25 Kg

(3.649327 x 10^-25 Kg) / (1.6605 x 10^-27 Kg) = 219.772779 u

219.772779 u -218.008684 u = 1.764095 u.

This is not correct. What am I doing wrong?