Physics~~please help!!! 20pt

A radioactive decay is described by the following reaction equation:

{220}_{87}Fr -----> {216}_{85}At + _?_

What symbol should "?" be repalced with?

Some useful constants for parts of this question:

1 atomic mass unit, u, has a mass of 1.660539 × 10^-27 kg.

c, the speed of light in a vacuum is 2.998 × 10^8 m/s

e, the charge on an electron is -1.602 × 10^-19 C

a) Select one:
a. {4}_{2}He (m = 4.00151 u)
b. {0}_{-1}e (m = 0.00054u)
c. {0}_{+1}e (m = 0.00054u)
d. γ

b) The mass of {220}_{87}Fr is 220.01233 u and the mass of {216}_{85}At is 216.00872 u. What is the mass defect in this nuclear fission reaction? Give your answer to five decimal places.

Answer:__ u

c) How much energy is released in this reaction. Give your answer in MeV.

Answer:___MeV

d) An appliance in your home requires 57.3 W to run. You want to run this appliance for one hour every day for a year. What mass of {220}_{87}Fr would you need if you were to use only this reaction to produce the energy and all the conversions were 100% efficient (ie all the energy produced from the nuclear reaction goes into running the appliance).

Answer:___ kg