Question

A. Beta emission is associated with: (SELECT ALL THAT APPLY)

a, b, c, d, e, f, g

B. Electron-capture is associated with: (ALL THAT APPLY)

a, b, c, d, e, f, g

C. Alpha emission is associated with (ALL THAT APPLY)

a, b, c, d, e, f, g

D. Positron emission is associated with (SELECT ALL THAT APPLY)

a, b, c, d, e, f, g

a. increase in mass number

b. emission of a photon

c. decrease in mass number

d. conversion of a proton to a neutron

e. decrease in atomic number

f. increase in atomic number

g. conversion of a neutron to a proton

Answer 1

A: Beta emission:

In beta emission, the mass number (A) remains same in the daughter element. Because electron has no mass.

Since charge of beta particle is -1, the atomic number(Z) increases by 1.

Also in beta emission, a neutron is converted to a proton and a beta particle.

Since this is a fission reaction, photon emission takes place.

Hence (b), (f) and (g) are correct.

B: Electron capture:

In electron capture, the mass number (A) remains same in the daughter element. Because electron has no mass.

Since charge of beta particle is -1, the atomic number(Z) decreases by 1.

Also in electron capture, a proton is converted to a neutron decreasing the atomic number by 1.

Hence (d) and (e) are correct.

C: Alpha emission:

Alpha particle has a mass number of 4 and charge of +2.

Hence in alpha emission, the mass number (A) decreases by 4.

And the the atomic number(Z) also decreases by 2.

Since this is a fission reaction, photon emission takes place.

Hence (b), (c) and (e) are correct.

D: Positron emission:

In positron emission, the mass number (A) remains same in the daughter element. Because positron has no mass.

Since charge of positron is -1, the atomic number(Z) decreases by 1.

Also in positron, a proton is converted to a neutron decreasing the atomic number by 1.

Since this is a fission reaction, photon emission takes place.

Hence (b), (d) and (e) are correct.