Ionic Radius

Which of the following will have a larger radius than Zinc?

• Gallium

• Aluminum

• Magnesium

• Strontium

What is the trend for ionic radius down a group?

• increase

• decrease

• remain constant

A sodium atom (Na) loses an electron to form a sodium ion (Na⁺¹). Which statement is correct in regards to describing the ionic radius.

• The sodium ion (Na⁺¹) has a larger radius than the neutral sodium atom (Na).

• The sodium ion (Na⁺¹) has a smaller radius than the neutral sodium atom (Na).

• The sodium ion (Na⁺¹) and the neutral sodium atom (Na) are the same size because they are both sodium.

• The sodium ion (Na⁺¹) has twice the radius of the neutral sodium atom (Na).

Tags

NGSS.HS-PS1-1

What is the effect of ionic radii on the strength of ionic bonds?

• Larger ionic radii result in stronger ionic bonds.

• Smaller ionic radii result in stronger ionic bonds.

• Ionic radii have no effect on bond strength.

• Ionic radii only affect covalent bonds.

Answer explanation

Smaller ionic radii lead to stronger ionic bonds because the distance between the charged ions decreases, resulting in a stronger electrostatic attraction. Larger ions are farther apart, weakening the bond.

Tags

NGSS.HS-PS2-4

What happens to the ionic radii of cations compared to their neutral atoms?

• Ionic radii increase.

• Ionic radii decrease.

• Ionic radii remain the same.

• Ionic radii become zero.

Answer explanation

Ionic radii decrease when atoms lose electrons to form cations. This loss reduces electron-electron repulsion and allows the remaining electrons to be pulled closer to the nucleus, resulting in a smaller ionic radius.

Which of the following ions has the smallest ionic radius?

Put these in increasing order of ionic radii:
Ca, Ca+, Ca+2

• Ca < Ca+ < Ca+2

• Ca+2 < Ca+ < Ca

• Ca+ < Ca+2 < Ca

Explain why the ionic radius of an anion is larger than its atomic radius.

• Due to loss of electrons

• Due to gain of electrons

• Due to increased nuclear charge

• Due to decreased electron shielding

Which of the following ions has the largest ionic radius?

Answer explanation

The ionic radius increases with negative charge and decreases with positive charge. Among the given ions, Cl^- has the largest ionic radius due to its extra electron, while Na^+, Mg^{2+}, and Al^{3+} are all cations with smaller radii.

Arrange the following by decreasing ionic radius: Ag⁺¹, In⁺³, Cd⁺², Sn⁺⁴?

• Ag⁺¹, In⁺³, Cd⁺², Sn⁺⁴

• Ag⁺¹, Cd⁺², In⁺³, Sn⁺⁴

• Sn⁺⁴, In⁺³, Cd⁺², Ag⁺¹

• Sn⁺⁴, Cd⁺², In⁺³, Ag⁺¹