13. atomic number
a. equals protons
b. identifies the element
c. equals electrons in an atom, but not in an ion
d. all of the above
14. atomic mass from periodic table equals
a. protons
b. neutrons
c. electrons
d. weighted average mass of all element’s isotopes
15. for the isotope nitrogen-15, the number 15 represents
a. protons
b. neutrons
c. atomic number
d. atomic mass

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Accepted Answer

### Question 13:
# Brief Explanations:
Atomic number equals the number of protons (which identifies the element) and in a neutral atom, also equals electrons (but not in ions). So "all of the above" is correct as atomic number identifies the element, equals protons, and in neutral atoms equals electrons.
# Answer:
d. all of the above

### Question 14:
# Brief Explanations:
Atomic mass from the Periodic Table is the weighted average mass of all an element’s isotopes, considering their abundances. It’s not just protons, neutrons, or electrons count.
# Answer:
d. weighted average mass of all element’s isotopes

### Question 15:
# Brief Explanations:
For an isotope like Nitrogen - 15, the number (15) represents the atomic mass number, which is the sum of protons and neutrons in the nucleus.
# Answer:
c. atomic number (Note: Correction - should be "c. atomic mass number" as the 15 in Nitrogen - 15 is the atomic mass number, sum of protons and neutrons. If the option is labeled c as atomic number, there might be a typo, but based on isotope notation, the number is atomic mass number. Assuming the option c is atomic mass number (maybe a label error), the answer is c (atomic mass number) or if c is atomic number, re - check. But typically, Nitrogen - 15: atomic number of N is 7 (protons), so 15 is protons + neutrons = atomic mass number. So the answer is c (if c is atomic mass number) or as per the given options, if c is atomic number, there's a mistake, but likely the intended answer is c (atomic mass number, maybe option label error) or d? Wait, the options are a. protons, b. neutrons, c. atomic number, d. atomic mass. Wait, no, atomic number of N is 7. So Nitrogen - 15: 15 is the atomic mass (mass number), which is protons + neutrons. So the number 15 represents atomic mass (mass number). So the answer is d. atomic mass? Wait, no, mass number is protons + neutrons, and atomic mass is the weighted average. But in isotope notation, the number is mass number (protons + neutrons). So maybe the option d is atomic mass (but that's incorrect, it's mass number). But based on the given options, the best is d? Wait, no, the options: a. protons, b. neutrons, c. atomic number, d. atomic mass. Wait, atomic number of N is 7. So 15 can't be atomic number. So the 15 is the mass number, which is sometimes called atomic mass in basic contexts (though technically atomic mass is different). So the answer is d. atomic mass.
# Answer:
d. atomic mass

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