AP Periodic Trends Lesson

AP Periodic Trends Lesson

by Andrew Baldwin

​Objectives

​Explain the relationship between trends in atomic properties of elements and electronic structure and periodicity.

• ​The organization iof the PTE is based on recurring properties of the elements and is explained by the electron configuration.

• ​Trends of focus include: Ionization energy, Atomic and Ionic Radii

• ​Electron Affinity, and Electronegativity.

• ​Periodicity is valuable to predict/estimate values of properties in the absence of data .

Multiple Choice

How many electrons are represented by this spectrum?

• 1

• 2

• 4

• 8

Multiple Choice

Which atomic arbital(s) are represented by this spectrum

• 1s

• 2s

• 3s

• two of these

Fill in the Blanks

Open Ended

Why is the peak for B shifted to the right more than Be? Explain using Coulomb's Law. (beware: read the scale at the bottom) 

Poll

Rate your Confidence from Firday's Lesson

• I am outside.

• I am almost there. 

• I am in the neighborhood.

• I am in the city.

Multiple Choice

When Magnesium becomes an ion the radius decreases. Which of the statements below best explains this observation. 

• The number of electrons decreases so the attraction increases.

• The number of protons decreases so the attraction decreases

• The number of protons increases so the attraction increases.

• The number of electrons increases so the attraction decreases. 

Open Ended

Why does the radius increase when Chlorine becomes an Ion? Use principles of Atomic Structure and Coulomb's Law to Support your answer.