Trends in Atomic Size

The video tutorial explains how to determine which atom is larger between calcium and oxygen by examining their atomic radii. It uses the periodic table to illustrate that atomic size decreases across periods and increases down groups. Calcium, being lower in its group than oxygen, is larger. The tutorial concludes with a summary of these trends and their implications for atomic size.

Which element is larger in terms of atomic radius, calcium or oxygen?

• Calcium

• Oxygen

• Both are the same size

• It depends on the isotope

What happens to the size of atoms as you move across a period in the periodic table?

• Atoms become more metallic

• Atoms get larger

• Atoms remain the same size

• Atoms get smaller

As you move down a group in the periodic table, what happens to the atomic size?

• It increases

• It fluctuates

• It decreases

• It remains constant

Why is calcium larger than oxygen in terms of atomic radius?

• Oxygen has a higher atomic number

• Oxygen is a gas

• Calcium is lower in its group

• Calcium has more protons

Which trend is observed in atomic size across periods?

• Size increases

• Size decreases

• Size remains the same

• Size fluctuates

What is the general trend in atomic size down a group?

• Size becomes unpredictable

• Size decreases

• Size increases

• Size remains constant