Exploring Atomic Radius Trends in the Periodic Table

The video tutorial explains the concept of atomic radius, using bromine as an example. It discusses how atomic radius is calculated and explores trends across periods and down groups in the periodic table. The video also covers the reasons behind these trends, such as effective nuclear charge and energy levels. Finally, it provides practice problems to reinforce understanding of atomic radius trends.

What is the atomic radius of a bromine atom if the distance between the nuclei of two bromine atoms is 228 picometers?

• 114 picometers

• 228 picometers

• 57 picometers

• 456 picometers

As you move from left to right across a period in the periodic table, what generally happens to the atomic radius?

• It fluctuates randomly

• It increases

• It remains the same

• It decreases

Which element has a smaller atomic radius: carbon or nitrogen?

• Both have the same atomic radius

• Cannot be determined

• Nitrogen

• Carbon

What is the effective nuclear charge felt by the valence electron in a lithium atom?

• +3

• +2

• +1

• 0

Why does the atomic radius decrease as you move from left to right across a period?

• Because the number of energy levels decreases

• Because the number of neutrons increases

• Because the number of protons decreases

• Because the effective nuclear charge increases

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

• It decreases

• It remains the same

• It increases

• It fluctuates randomly

Which element is larger: sodium or lithium?

• Sodium

• Lithium

• Both are the same size

• Cannot be determined

Which element has a larger atomic radius: calcium or magnesium?

• Calcium

• Magnesium

• Both have the same atomic radius

• Cannot be determined

Which element is larger: silicon or phosphorus?

• Cannot be determined

• Silicon

• Phosphorus

• Both are the same size

Rank the following elements in order of increasing atomic size: neon, chlorine, selenium, tin, cesium.

• Neon, Selenium, Chlorine, Tin, Cesium

• Chlorine, Neon, Selenium, Tin, Cesium

• Cesium, Tin, Selenium, Chlorine, Neon

• Neon, Chlorine, Selenium, Tin, Cesium