7. Which element has 13 protons, 13 electrons, and 14 neutrons?
Answer: C
Al has 13 protons, 13 electrons, and 14 neutrons.
Aluminum (Al) is the element that has 13 protons and 13 electrons, which means it is electrically neutral. The presence of 14 neutrons gives it an atomic mass of approximately 27.
A) Fe
Iron (Fe) has an atomic number of 26, which indicates it has 26 protons. Therefore, it cannot have 13 protons, making this option incorrect.
B) Zr
Zirconium (Zr) has an atomic number of 40, corresponding to 40 protons. This disqualifies it from having 13 protons and electrons, thus making this option incorrect.
C) Al
Aluminum (Al) has an atomic number of 13, which means it has 13 protons and, when neutral, also has 13 electrons. The additional 14 neutrons are typical for its most common isotope, confirming that this option is correct.
D) Not enough information
This choice suggests a lack of sufficient data to determine the element in question. However, the details provided—13 protons, 13 electrons, and 14 neutrons—are definitive for identifying aluminum, making this option incorrect.
Conclusion
Aluminum is the only element listed that matches the criteria of having 13 protons and 13 electrons, along with 14 neutrons. All other options either represent different elements or incorrectly suggest a lack of information. Therefore, option C is definitively correct, while the others fail to meet the specified characteristics.