Final answer:
Cobalt, iron, and nickel are ferromagnetic elements. They can be magnetized and are strongly attracted to magnets. If these are among the options provided, the correct answer to the ferromagnetic element would be 'All of these are ferromagnetic' or the specific one listed.
Step-by-step explanation:
The ferromagnetic elements are materials that exhibit strong magnetic effects, such as being able to be permanently magnetized. The elements listed as ferromagnetic include iron, cobalt, nickel, and gadolinium. Therefore, the ferromagnetic elements from the options provided are cobalt, iron, and nickel. These materials are called ferromagnetic after the Latin word for iron, ferrum. Knowing this, the correct answer to the question which element listed below is ferromagnetic is:
- B. Cobalt
- D. Iron
- E. Nickel
Each of these elements can be magnetized and are attracted to magnets. Cobalt, iron, and nickel are the main metals that are magnetic. When asked to choose from the options provided, one would go for C. All of these are ferromagnetic, if all listed are cobalt, iron, and nickel; if only one of them is listed, that would be the ferromagnetic element.