Which would result in radioactive decay? Check all that apply.

a neutron-to-proton ratio of 1:1 in a small nucleus

a neutron-to-proton ratio of 1:2 in a large nucleus

a nucleus that contains 90 protons and 100 neutrons

a nucleus that contains 8 protons and 8 neutrons

any isotope of the element uranium, which has atomic number 92

any isotope of the element potassium, which has atomic number 19

Large nuclei with a neutron to proton ratio of 1:2, a nucleus that contains 90 protons and 100 neutrons, any isotope of the element uranium, which has atomic number 92, will decay radioactively.

What is radioactive decay?

In radioactive decay, an unstable nucleus emits radiation, loses energy and loses protons or neutrons
The most common types of radioactive decay are alpha and beta decay, and gamma emission

To identify which nuclei will decay, we have to understand the conditions for radioactive decay.

When does radioactive decay occur?

Radioactive decay occurs in unstable nuclei
Unstable nuclei could mean that the nucleus is extremely heavy
Heavy nuclei have a large number of protons and neutrons
Another characteristic of unstable nuclei is that the number of protons and neutrons is not similar or their ratio is less than or greater than one

Therefore, radioactive decay will take place in the following:

Large nuclei with a neutron to proton ratio of 1:2
A nucleus that contains 90 protons and 100 neutrons
Any isotope of the element uranium, which has atomic number 92

Learn more about radioactive isotopes here:

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