Matter in the state completely fills the volume of its container

Gas state

Explanation:

Gas particles spread out to fill a container evenly, unlike solids and liquids.

gas state

Explanation:

Gas molecules have either very weak bonds or no bonds at all, so they can move freely and quickly. Because of this, not only will a gas conform to the shape of its container, it will also expand to completely fill the container. Gas molecules have enough kinetic energy that the effect of intermolecular forces is small (or zero, for an ideal gas), and they are spaced very far apart from each other; the typical distance between neighboring molecules is much greater than the size of the molecules themselves.

distance, luminosity, brightness, radius, chemical composition, and temperature

a electronegativity decreases beacuse the size of nucleus is bigger.