Ionic and Atomic Radius Concepts

The video tutorial explains the concept of ionic radius, comparing it to atomic radius. It introduces ions, cations, and anions, and describes how gaining or losing electrons affects the size of an atom. The tutorial also covers the trends in ionic radius across periods and groups in the periodic table, highlighting how cations become smaller and anions become larger due to electron interactions.

What is the octet rule in chemistry?

• Atoms require eight electrons in their innermost shell.

• Atoms aim to have eight protons in their nucleus.

• Atoms strive to have eight valence electrons for stability.

• Atoms need eight neutrons to be stable.

What happens to an atom when it becomes a cation?

• It gains electrons and becomes larger.

• It gains protons and becomes larger.

• It loses protons and becomes smaller.

• It loses electrons and becomes smaller.

Which of the following is true about anions?

• They are positively charged ions.

• They lose electrons to form.

• They have fewer electrons than protons.

• They gain electrons and become larger.

Which of the following statements is true about cations?

• They are formed by gaining electrons.

• They are larger than their parent atoms.

• They are positively charged.

• They have more electrons than protons.

How does the ionic radius of sodium change when it becomes a cation?

• It becomes smaller due to electron loss.

• It becomes larger due to electron gain.

• It remains the same size.

• It becomes larger due to proton gain.

What causes the increase in size of an anion compared to its neutral atom?

• Decreased electron repulsion.

• Gain of protons.

• Loss of protons.

• Increased electron repulsion.

What is the main reason for the size increase in anions?

• Decreased electron repulsion.

• Addition of neutrons.

• Addition of protons.

• Increased electron repulsion.

How does the ionic radius trend across a period in the periodic table?

• It decreases from left to right.

• It remains constant.

• It fluctuates randomly.

• It increases from left to right.

What happens to the ionic radius as you move down a group in the periodic table?

• It fluctuates randomly.

• It remains constant.

• It increases.

• It decreases.

What is the relationship between atomic radius and ionic radius trends?

• They follow similar trends.

• They are completely opposite.

• They are unrelated.

• They are identical in all aspects.