It looks like you're seeking information about an element based on the given number of electrons (39) and atomic mass (89).
From the information:
- The element has 39 electrons, which means its atomic number is also 39 since a neutral atom has an equal number of protons and electrons.
- The atomic mass (89) suggests a specific isotope of the element.
Based on the atomic number 39, the element is Yttrium (Y).
Here's the filled table:
| Atomic symbol | Atomic Number | Protons | Neutrons | Electrons | Atomic mass | |---------------|---------------|---------|----------|-----------|-------------| | Y | 39 | 39 | 50 | 39 | 89 |
This information shows that Yttrium has 39 protons and typically has 50 neutrons in its most common isotope (Y-89), giving it an atomic mass close to 89.