Question

The parent element 42 19 K decays by beta decay. Which daughter element will

form?
O A. Ca
OB. 1 Ar
O C. C
OD. K

Answer 1

Answer: A

Step-by-step explanation:

This means that the atomic number decreases by 1 but the mass remains constant, meaning the atomic number of the new element is 20. This corresponds to calcium.