Metals Atomic Number Comparison
The question asks to identify which metal among Sodium, Magnesium, Aluminium, and Calcium has the highest atomic number. The atomic number ($Z$) represents the number of protons in the nucleus of an atom and uniquely identifies a chemical element.
Element Atomic Numbers
To find the metal with the highest atomic number, let's list the atomic numbers for each element provided:
| Metal | Symbol | Atomic Number ($Z$) |
|---|---|---|
| Sodium | Na | $Z=11$ |
| Magnesium | Mg | $Z=12$ |
| Aluminium | Al | $Z=13$ |
| Calcium | Ca | $Z=20$ |
Determining the Highest Value
Now, we compare the atomic numbers listed:
- Sodium: 11
- Magnesium: 12
- Aluminium: 13
- Calcium: 20
Comparing these values, we can see that 20 is the largest number among 11, 12, 13, and 20.
Identifying the Metal with Highest Atomic Number
The atomic number 20 corresponds to the element Calcium.
Therefore, among the given options, Calcium is the metal with the highest atomic number.
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