Worksheet Density Atomic And Ionic Radii. Lab Summary: Reactivity and the Periodic Table (due Monday). On the periodic table, atomic radius generally decreases as you move from left to right across a period (due to increasing nuclear charge) and increases as you move down a group.
Ionic Radius - The ionic radius is a measure of the size of the spherical region around the nucleus of an ion within which the electrons are most likely to be found. Cations, or positively charged ions, are smaller than their "parent" atoms. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period.
The following chart so both the atomic and ionic radii for some common ions.
This quiz is focused on atomic structure as it relates to periodic properties like atomic and ionic radii, electronegativity and ionic charge.
The nucleus pulls more strongly on the elections, causing the atomic radii to decrease. Describe how the atomic radius changes within a group. Atomic and ionic radii are found by measuring the distances between atoms and ions in chemical compounds.