What is the change in atomic mass number when an atom emits an alpha particle?
a.
decreases by 2
c.
increases by 2
b.
decreases by 4
d.
increases by 4

B. decreases by 4

Explanation:

B. decreases by 4

Explanation:

1. Decreases by 4. (B)

2. The atomic number changes. (B)

3. 56/26 Fe. (C)

4. Potassium-40;t1/2=25 days. (B)

5. Takes place in the upper atmosphere. (A)

1. Decreases by 4. (B)

2. The atomic number changes. (B)

3. 56/26 Fe. (C)

4. Potassium-40;t1/2=25 days. (B)

5. Takes place in the upper atmosphere. (A)

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