Which of the following correctly identifies both the number and location of protons in a lithium (Li) atom?

• A. 1 proton located in the nucleus
• B. 6 protons located in the nucleus
• C. 3 protons located in the nucleus
• D. 3 protons located in the electron cloud

Answer: (C)

Verified step by step guidance

1. Recall that the number of protons in an atom is equal to its atomic number, which is unique for each element. For lithium (Li), the atomic number is 3.
2. Understand that protons are positively charged particles located in the nucleus of an atom, not in the electron cloud.
3. Identify that the correct number of protons in a lithium atom is 3, based on its atomic number.
4. Confirm that these 3 protons are located in the nucleus, as all protons reside in the nucleus of an atom.
5. Therefore, the correct description is '3 protons located in the nucleus' for a lithium atom.