« Return to AACT homepage

AACT Member-Only Content

You have to be an AACT member to access this content, but good news: anyone can join!

Have a student passcode? Enter it below to access our videos, animations, and ChemMatters Issues.

Need Help?

In this activity, students will use their knowledge of the periodic table and periodic trends to add fictional elements to a periodic table based on their properties. Once the elements are in the correct place they will reveal a hidden message. This review activity will help students prepare for a summative assessment such as a unit test or final exam.

  • Um is in the 3rd period and has three electrons in its highest p-orbitals.
  • St is a gas that does not belong to a specific family.
  • Ea, Nd and Dy are all alkali metals. 
  • F, En, and K are alkaline earth metals. 
  • A and Rb are halogens. 
  • Ma, U and R are all elements that have a full octet. 
  • Me and Ex both form -2 ions. 
  • The ionization energy trend for the elements that form +1 ions is Ea < Nd < Dy.
  • The electronegativity value for En is greater than K, but it is less than F.
  • A has a smaller atomic radius than Rb.
  • R is the noble gas with the largest atomic radius.
  • Me has a smaller value for ionization energy than Ex.
  • Th, Or and E are all located in the second period. 
  • Ma has one less proton than Nd.
  • Jo would form a +3 cation and is a metal.
  • The electronegativity values of Th is less than E but greater than Or.
  • Ys can only form a +4 ion.

Write the hidden message in the space below.