Trends in Atomic Size and Radius

The video tutorial explores the atomic sizes of barium and calcium using the periodic table. It explains that atomic size increases down a group and decreases across a period. By examining the positions of barium and calcium on the periodic table, it concludes that barium is larger than calcium due to its position further down in group two.

What is the primary method used to compare the sizes of barium and calcium?

• Using a microscope

• Referring to the periodic table

• Conducting a chemical reaction

• Measuring their weights

What happens to atomic size as you move down a group in the periodic table?

• It increases

• It remains the same

• It decreases

• It fluctuates

How does atomic size change as you move across a period from left to right?

• It remains constant

• It first increases then decreases

• It increases

• It decreases

Why is barium larger than calcium?

• Barium has a smaller atomic number

• Barium is further down in the same group

• Barium has more protons

• Barium is in a higher period

Which element is located lower in Group 2 of the periodic table?

• Magnesium

• Calcium

• Barium

• Strontium

What is the general trend for atomic radius as you move down a group?

• Atomic radius decreases

• Atomic radius increases

• Atomic radius becomes unpredictable

• Atomic radius remains unchanged