Periodic Trends in Chemistry

This video tutorial covers periodic trends, focusing on atomic radius, ionization energy, and electronegativity. It explains how these trends are observed across periods and down groups in the periodic table. The tutorial also discusses the formation of ions and their impact on atomic radius, emphasizing the importance of reference tables for understanding these concepts. The lesson concludes with a reminder of upcoming assessments and encourages students to bring questions to class.

What is the main reason for not memorizing periodic trends?

• They are too complex to understand.

• They change frequently.

• Reference tables provide the necessary data.

• They are not important for exams.

How does the atomic radius change as you move across a period?

• It decreases.

• It fluctuates randomly.

• It increases.

• It remains the same.

What happens to the size of a metal atom when it loses an electron to form a cation?

• It becomes larger.

• It becomes smaller.

• It remains the same size.

• It becomes unstable.

Which of the following is true about nonmetals when they form anions?

• They gain electrons and become smaller.

• They gain electrons and become larger.

• They lose electrons and become smaller.

• They lose electrons and become larger.

What is electronegativity?

• The ability of an atom to lose electrons.

• The size of an atom.

• The ability of an atom to attract electrons in a bond.

• The energy required to remove an electron.

How does electronegativity change as you move down a group?

• It remains constant.

• It decreases.

• It fluctuates.

• It increases.

What is ionization energy?

• The energy needed to form a bond.

• The energy needed to split an atom.

• The energy needed to remove an electron.

• The energy needed to add an electron.

As you move across a period, how does ionization energy change?

• It fluctuates.

• It decreases.

• It remains the same.

• It increases.

Why is ionization energy similar to electronegativity?

• Both involve losing electrons.

• Both involve the removal of protons.

• Both involve gaining electrons.

• Both involve the attraction of electrons.

What happens to ionization energy as you move down a group?

• It increases.

• It decreases.

• It remains constant.

• It fluctuates.