Atomic Radius Trends in the Periodic Table

What does the periodic table arrange elements by?

• Random order

• Alphabetical order

• Increasing atomic number

• Decreasing atomic mass

Why does the atomic radius decrease as you move across a period?

• The number of protons decreases

• The positive charge in the nucleus decreases

• The number of electron shells decreases

• The attraction between the nucleus and electrons increases

Which of the following elements would have the smallest atomic radius in Period 2?

• Lithium

• Beryllium

• Fluorine

• Carbon

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

• It remains the same

• It decreases

• It increases

• It fluctuates randomly

Which factor contributes to the increase in atomic radius down a group?

• Decrease in atomic number

• Decrease in electron shells

• Increase in nuclear charge

• Increase in electron shielding