https://file.aiquickdraw.com/mathbot/file/1726895191840414h71bk.jpg

From the diagram:

1. **Counting Protons:**
   - Each "p+" represents a proton.
   - There are 15 "p+" symbols in the nucleus.
   - **Total protons = 15.**

2. **Counting Neutrons:**
   - Each "n" represents a neutron.
   - There are 16 "n" symbols in the nucleus.
   - **Total neutrons = 16.**

3. **Mass Number or Nucleon Number:**
   - This is the sum of protons and neutrons.
   - Mass number = Total protons + Total neutrons = 15 + 16 = **31**.

4. **Element Name:**
   - An element with 15 protons corresponds to **Phosphorus (P)**.

5. **Isotope Symbols:**
   - a. \( \text{P-31} \) (Element symbol with mass number).
   - b. \( \frac{31}{15} \text{P} \) (Mass number over atomic number).

Would you like further details or have any questions?

### Relative Questions:
1. What is the significance of the mass number in isotopes?
2. How does the neutron number affect the stability of an element?
3. What are the uses of different isotopes of phosphorus?
4. Can the number of neutrons in an element vary, and if so, how does it affect the element?
5. What other isotopes of phosphorus exist, and how do they differ?

**Tip:** The number of protons in an atom determines the element, while the number of neutrons determines the isotope of that element.

Based on the diagram, determine the total protons, total neutrons, mass number, element name, and isotope symbols.

Learn how to calculate the number of protons, neutrons, and the mass number from a nucleus diagram. Identify the element and write isotope symbols, explained for high school students studying chemistry.

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