Atomic Radius and Periodic Trends

The video tutorial explains how to determine which atom, potassium (K) or magnesium (Mg), has a larger atomic radius. It discusses the trends in atomic size on the periodic table, noting that atomic size increases down a group and decreases across a period. Potassium, being lower in the group, is expected to have a larger atomic radius than magnesium. The tutorial concludes that potassium has the larger atomic radius.

What is the main question addressed in the video regarding potassium and magnesium?

• Which atom has a higher atomic number?

• Which atom has a larger atomic radius?

• Which atom has a higher melting point?

• Which atom is more reactive?

Why are transition metals excluded from the discussion in the video?

• They have the smallest atomic radii.

• They follow the same trends and are excluded for simplicity.

• They do not follow any trends.

• They are not part of the periodic table.

How does atomic size change as you move down a group in the periodic table?

• It fluctuates randomly.

• It remains the same.

• It increases.

• It decreases.

Which element is identified as having the largest atomic radius on the periodic table?

• Magnesium

• Potassium

• Cesium

• Helium

Why is potassium expected to have a larger atomic radius than magnesium?

• Magnesium is higher in the group.

• Magnesium is lower in the group.

• Potassium is lower in the group.

• Potassium is higher in the group.

What is the conclusion about the atomic radius of potassium compared to magnesium?

• Potassium has a larger atomic radius.

• Both have the smallest atomic radii.

• Potassium and magnesium have the same atomic radius.

• Magnesium has a larger atomic radius.