Trends in Atomic Radius

The video tutorial explains how to determine which atom is larger between calcium and strontium by examining their positions on the periodic table. It highlights that as you move down a group in the periodic table, the atomic radius increases. Therefore, strontium, being below calcium in the same group, has a larger atomic radius. The video uses the periodic table to illustrate this trend and concludes with a summary of the findings.

What is the main question posed at the beginning of the video?

• Which element has a higher atomic number?

• Which atom is larger: calcium or strontium?

• Which element is more reactive?

• Which atom has a smaller atomic radius?

Where is strontium located in relation to calcium on the periodic table?

• Above calcium

• To the left of calcium

• Below calcium

• To the right of calcium

How can you determine the relative size of strontium and calcium using the periodic table?

• By looking at their atomic numbers

• By comparing their positions in the same period

• By observing their positions in the same group

• By checking their electron configurations

What trend is observed in atomic radius as you move down a group in the periodic table?

• The atomic radius decreases

• The atomic radius remains the same

• The atomic radius fluctuates

• The atomic radius increases

Why is strontium larger than calcium?

• Because it is lower in its group

• Because it has fewer electrons

• Because it is higher in its group

• Because it has more protons

What is the significance of the trend in atomic radius for elements in the same group?

• It helps compare the size of atoms

• It shows the increase in atomic mass

• It helps predict reactivity

• It indicates the number of valence electrons