Which of the following elements tend to be radioactive? check all that apply. a. mgb. puc. fed. th

Explanation:

An atom which has greater difference in the number of number of protons and neutrons will be unstable in nature. This is because then nuclear binding energy will not be strong enough to hold the neutrons and protons together.

For example, and are both radioactive in nature due to large difference in the number of protons and neutrons.

Whereas for and there is not much difference in the number of protons and neutrons.

Thus, we can conclude that both Pu and Th elements tend to be radioactive in nature.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.