Two examples of elements that have different atomic numbers but share a relative atomic number are:
Lithium (Li) and Sodium (Na): Lithium has an atomic number of 3, while sodium has an atomic number of 11. Despite the difference in their atomic numbers, both elements have a relative atomic number of approximately 23. This relative atomic number signifies that both lithium and sodium have similar chemical properties and belong to the same group or column in the periodic table, known as the alkali metals.
Nitrogen (N) and Phosphorus (P): Nitrogen has an atomic number of 7, while phosphorus has an atomic number of 15. However, both nitrogen and phosphorus have a relative atomic number of approximately 31. This relative atomic number indicates that both elements share similar chemical properties and belong to the same group or column in the periodic table, known as the pnictogens or Group 15 elements.
In both examples, despite the difference in the actual atomic numbers of the elements, their relative atomic numbers demonstrate their similar positions within the periodic table and their comparable chemical properties.