Ionic measurement

atomic size

atomic radii

ionic radii

Cations are larger than their respective atoms because of decreased electron repulsion

Cations are larger than their respective atoms because of increased electron repulsion

Anions are smaller than their respective atoms because of increased effective nuclear charge

Se², Zr⁴⁺, Mg, Rb⁺, Br^-, K⁺

Mg, Rb⁺, Br^-, Se², Zr⁴⁺, K⁺

K⁺, Br^-, Se², Zr⁴⁺, Mg, Rb⁺,

Zr⁴⁺, K⁺, Rb⁺, Mg, Br^-, Se²

c+ and c-

a+ and a-

r+ and r-

none

Decrease

Increase

Remain same

None

smaller

same

none

greater

the atom becomes smaller and the so the electrons in outer shells are closer to the center.

the atom becomes bigger, so the electrons in the outer shell are further apart from the center.

the atom becomes smaller, so the electrons in the outer shells are further apart from the center.

because there are no charged atoms.

because the protons and electrons cancel each other's charges.

because there is more nuclear charge between protons and electrons.

Whether positive or negative ion, the ionic size increases as we move down a column

Ionic size first decreases and then increases as we move down a column.

Whether a positive or negative ion, the ionic size decreases as we move down a column.

Ionic size first increases and then decreases as we move down a column.

Valence electrons shield other valence electrons from nuclear charge

 Core electrons shield other core electrons from nuclear charge

 Valence electrons shield core electrons from nuclear charge

 Core electrons shield valence electrons from nuclear charge