Effective Nuclear Charge and Periodicity

The video tutorial discusses the concept of periodicity and properties of elements in relation to the periodic table. It explains how periodic properties are related to periodic motion and describes the tendency of elements to gain electrons as one moves from left to right across a period. The tutorial also covers the concept of effective nuclear charge and its influence on periodic trends.

What does periodicity in the properties of elements refer to?

• Random changes in properties

• Regular intervals of property changes

• Irregular intervals of property changes

• No change in properties

Which of the following best describes periodic motion?

• Motion that occurs at irregular intervals

• Motion that never repeats

• Motion that repeats at regular intervals

• Motion that is unpredictable

How does the tendency to gain electrons change as we move from left to right across a period?

• It fluctuates randomly

• It remains the same

• It decreases

• It increases

What happens to the effective nuclear charge as we move across a period from left to right?

• It decreases

• It remains constant

• It fluctuates

• It increases

Which of the following is a consequence of increased effective nuclear charge across a period?

• Increased atomic radius

• Decreased electron affinity

• Increased electron affinity

• Decreased ionization energy