Roentgenium is a synthetic element studied through tiny numbers of short-lived atoms.
Uses and research
Roentgenium is a synthetic element studied through tiny numbers of short-lived atoms.
Research with individual atoms
This synthetic element is studied using very small numbers of atoms. Its position provides clues for comparison with lighter elements, but many bulk properties have not been measured. Predictions should be distinguished from observations.
What the atomic number tells us
Roentgenium has atomic number 111. This is the number of protons in its nucleus. A neutral atom also has 111 electrons. Losing or gaining electrons makes an ion; it does not change the element unless the proton count changes.
The model's rings help count electrons by shell. They are not actual circular paths. Its electron configuration includes predictions, and the appearance is not a measured bulk sample.
Temperature and state
25°C: Data not included
Illustrative particle motion: sizes, distances and speeds are not to scale. Particles represent atoms or molecules.
← CoolHeat →
Temperature data is not included in this guide.
Pure element at 1 atmosphere. Image conditions are explained in captions. Pictures do not change with temperature.
