Question

storyline 1 exam
which characteristic is not a periodic trend?
electron affinity
ionization energies
atomic radius
number of elements in a group

Explanation:

• Electron affinity, ionization energies, and atomic radius show periodic trends in the periodic table.
• The number of elements in a group is a fixed characteristic (e.g., Group 1 has a certain number of elements) and does not follow a periodic trend that changes in a regular pattern across periods or groups in the sense of the other properties.

Answer:

number of elements in a group