The atomic symbol mc025-1.jpg represents potassium-40 (k-40), a radioactive isotope that has 19 protons and 21 neutrons. which atomic symbol could represent an isotope that results from the decay of k-40?

a) 40 ar
18

b) 40 k
18

c) 42 ca
20

d) 42 k
20

The correct option is A.

Explanation: For a radioactive isotope of potassium, which is having 19 protons and 21 neutrons, the decay processes are beta-decay and electron capture.

Potassium-40 undergoing decay processes:

From the two processes, the K-40 isotope forms by electron capture. So, the correct option is A.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

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