Ionic Radius and Ion Size Concepts

The video explores trends in ionic radii, highlighting differences between atomic and ionic radii. It explains why positive ions are smaller and negative ions are larger than their parent atoms. The video examines trends down a group and across a period, focusing on isoelectronic ions and the influence of protons on ionic radii. It concludes by comparing the sizes of ions and their parent atoms, emphasizing the role of electron configuration and energy levels.

What is the general trend observed for positive ions compared to their parent atoms?

• Positive ions are larger than their parent atoms.

• Positive ions are smaller than their parent atoms.

• Positive ions have the same size as their parent atoms.

• Positive ions have more electrons than their parent atoms.

Why do ionic radii increase as you move down Group 1?

• Due to a decrease in nuclear charge.

• Because of an increase in occupied energy levels.

• Due to a decrease in electron shielding.

• Because the ions gain more electrons.

What happens to the ionic radii of Period 3 elements as you move from sodium to silicon?

• The ionic radii increase.

• The ionic radii decrease.

• The ionic radii first increase then decrease.

• The ionic radii remain constant.

What is the reason for the decrease in ionic radii from sodium ion to aluminium ion?

• Decrease in nuclear charge.

• Increase in electron shielding.

• Increase in nuclear charge with the same electron configuration.

• Decrease in occupied energy levels.

Which of the following ions is isoelectronic with the sodium ion?

• Phosphide ion

• Chloride ion

• Magnesium ion

• Oxide ion

What is the trend in ionic radii for isoelectronic ions in Period 2?

• Ionic radii increase from nitrite to fluoride.

• Ionic radii decrease from nitrite to fluoride.

• Ionic radii remain constant.

• Ionic radii first increase then decrease.

Why do negative ions tend to be larger than their parent atoms?

• They have fewer protons than electrons.

• They have more protons than electrons.

• They have the same number of protons and electrons.

• They have fewer occupied energy levels.

What happens to the ionic radius when a sodium atom becomes a sodium ion?

• The ionic radius increases.

• The ionic radius decreases.

• The ionic radius remains the same.

• The ionic radius first increases then decreases.

Which of the following ions is larger than its parent atom?

• Chloride ion

• Aluminium ion

• Magnesium ion

• Sodium ion

What is the main reason for the size difference between a chlorine atom and a chloride ion?

• The chloride ion has more electrons than protons.

• The chloride ion has more protons than electrons.

• The chloride ion has fewer occupied energy levels.

• The chloride ion has the same number of protons and electrons.