Magnesium cannot transform into sodium. This is because they are different elements with different numbers of protons.

* Magnesium (Mg) has 12 protons.

* Sodium (Na) has 11 protons.

The number of protons defines an element. Changing the number of protons changes the element itself.

Nuclear reactions can change the number of protons in an atom, but these are typically very high-energy processes.

Here's a more likely scenario:

* Nuclear Reactions: In a nuclear reaction involving magnesium, a different element might be produced. For example, magnesium could be bombarded with neutrons, which could cause it to emit protons and transform into a different element. However, this wouldn't be a direct transformation into sodium.

Important Note: The statement "a second nucleus is produced" is a little misleading. While it is true that some nuclear reactions can produce multiple products, these products are not always other nuclei.

Let me know if you have any other questions!