Atomic Structure and Periodic Trends

The video tutorial by MSJ Chem discusses trends in atomic radii across periods and down groups in the periodic table. It explains that atomic radii decrease across a period due to increasing nuclear charge and constant electron shielding. Conversely, atomic radii increase down a group as the number of occupied energy levels rises, placing outer electrons further from the nucleus. The video concludes with a summary of these trends and references the IV data booklet for further information.

What is the general trend of atomic radii across period three?

• It fluctuates randomly.

• It remains constant.

• It decreases.

• It increases.

Why does the atomic radius decrease across a period?

• Due to decreasing electron shielding.

• Due to decreasing nuclear charge.

• Due to increasing electron shielding.

• Due to increasing nuclear charge.

What is the relationship between nuclear charge and atomic radius across a period?

• Nuclear charge does not affect atomic radius.

• As nuclear charge increases, atomic radius increases.

• As nuclear charge increases, atomic radius decreases.

• As nuclear charge decreases, atomic radius decreases.

What remains constant across a period that affects atomic radius?

• Nuclear charge

• Number of protons

• Number of neutrons

• Electron shielding

Which factor does not change significantly across a period?

• Nuclear charge

• Electron shielding

• Atomic number

• Number of neutrons

What happens to the attraction between the nucleus and outer electrons as you move across a period?

• It fluctuates.

• It increases.

• It remains constant.

• It decreases.

How does the number of occupied energy levels change down a group?

• It remains the same.

• It fluctuates.

• It increases.

• It decreases.

What is the effect of increasing occupied energy levels on atomic radius down a group?

• Atomic radius fluctuates.

• Atomic radius increases.

• Atomic radius remains constant.

• Atomic radius decreases.

Which element in Group 1 has the most occupied energy levels?

• Sodium

• Rubidium

• Lithium

• Potassium

Where can you find data on atomic and ionic radii in the IV data booklet?

• Section 11

• Section 5

• Section 7

• Section 9