Which of the following is not an example of a scientific model?
a.
a diagram of a cell
b.
a data table
c.
a three-dimensional representation of an atom
d.
a graph showing the change in temperature and volume over time for hydrogen gas

Option (b) is the correct answer.

Explanation:

A scientific model helps to display and explain an image, ides, object or process which cannot be imagined or experienced directly.

For example, a flow chart showing water cycle will help to experience or visualize the whole process of water cycling.

Therefore, diagram of a cell, three-dimensional representation of an atom and  a graph showing the change in temperature and volume over time for hydrogen gas are all representing scientific model.

Whereas data table does not tell anything about the scientific process so it is not an example of scientific model.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.