If an element has 12 protons, what is its atomic number?

An element's atomic number is defined as the number of protons found in the nucleus of an atom of that element. Therefore, if an element has 12 protons, its atomic number is simply 12. This is a fundamental concept in chemistry, as the atomic number determines the identity of the element and its position on the periodic table. Each element has a unique atomic number; for example, the element with an atomic number of 12 is magnesium. This is essential for understanding the behavior of the element in chemical reactions and its electronic configuration.