Final answer:
It is true that each element has a unique collection of electron energy levels. These levels are quantized with specific allowed values, and the arrangement of electrons across these levels gives each element its distinct characteristics.
Step-by-step explanation:
The statement that the collection of electron energy levels for an atom are unique for each element is true. The energies of electrons within an atom are quantized, which means they can only possess certain specific allowed values described by quantum numbers. These values are intimately related to the unique structure of each element's atom.
According to Bohr's model and modern atomic theory, electrons are arranged in energy levels or shells around an atom's nucleus. These energy levels are identified by principal quantum numbers (n) which are integers (such as n = 1, 2, 3, ...). The first energy level (n=1) is closest to the nucleus and contains the lowest energy electrons. As n increases, electrons are found farther from the nucleus and possess greater energy.
Each element has a distinctive number of protons and a unique electronic configuration, which dictates the allowed energy levels and the placement of electrons within those levels. This organization is why when electrons move between these levels, they emit or absorb specific quantities of energy, resulting in an element-specific emission spectrum.