What is relation between energy and speed of light

The equation: E=mc² means "energy equals mass times speed of light squared"

Explanation:

It shows that energy (E) and mass (M) are interchangeable, they are different forms of the same thing

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.