Answer:
Symbols of elements
Explanation:
Symbols of elements corresponding to their names do not vary systematically in the periodic table. The only systematic variation might be an alphabetical order, either ascending or descending, but we don't see this trend in the periodic table.
The other properties, however, vary systematically:
- Electronegativity: the closer an element is to fluorine, the more electronegative it is. The closer it is to francium, the less electronegative it is;
- Ionization energy: it decreases from right to left along the period and down the group, as atomic size increases and there's a lower attraction force between a nucleus and valence electrons;
- Atomic radius: it increases from right to left along the period and down the group.
