Final answer:
Adding 2 protons to lithium (Li), with an atomic number of 3, results in the formation of boron (B), which has an atomic number of 5.
Step-by-step explanation:
If you add 2 protons to lithium (Li), which has an atomic number of 3, you would get an element with an atomic number of 5. The element with atomic number 5 is boron (B). The atomic number is the number of protons in an atom, and each element is uniquely defined by its atomic number. Therefore, adding 2 protons to an atom of lithium would change it into an atom of boron.