Which phrases describe radioactive elements? check all that apply. occur in nature decay at a constant rate have a consistent number of particles have a half-life that determines their rate of decay release energy and particles to maintain radioactivity

occur in nature

have a consistent number of particles

have a half-life that determines their rate of decay

release energy and particles to maintain radioactivity

A radioactive element is an element which undergoes spontaneous degeneration of its nucleus, that results in the emission of the consistent number of particles that are alpha, beta and gamma particles. The elements in the periodic table with atomic number greater than 83 are radioactive. These elements occur in nature. The half-life of a radioactive element refers to the time required by the half of the radioactive material to decay.The unstable nucleus of the radioactive atom splits into many number of particles, with the release of large amount of energy to maintain it's stability and radioactivity.

100% correct answer

occur in nature

decay at a constant rate

have a half-life that determines their rate of decay

Explanation:

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.