Question

use the periodic table to find the number of protons neutrons, and electrons for atoms of the following elements.
Name of element element symbol mass number atomic number protons neutrons electrons
Yttrium

Answer 1

To find the number of protons, neutrons, and electrons for yttrium, we start with the periodic table information:

- **Element Name**: Yttrium
- **Element Symbol**: Y
- **Atomic Number**: 39 (This is the number of protons)
- **Mass Number**: Yttrium typically has a mass number of 89 (the most stable isotope).

**Calculating the number of neutrons**:
The number of neutrons can be calculated using the formula:

\[
\text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number}
\]

So for yttrium:

\[
\text{Number of Neutrons} = 89 - 39 = 50
\]

**Electrons**:
For a neutral atom, the number of electrons is equal to the number of protons. Therefore, for yttrium:

- **Number of Protons**: 39
- **Number of Neutrons**: 50
- **Number of Electrons**: 39

Here are the details in a tabular format:

| Name of Element | Element Symbol | Mass Number | Atomic Number | Protons | Neutrons | Electrons |
|------------------|----------------|-------------|---------------|---------|----------|-----------|
| Yttrium | Y | 89 | 39 | 39 | 50 | 39 |