Monday Feb 13th Chemistry class – Trends on the PT

Today you need to determine the meaning of :

A) Metals, non-metals, metalloids, Halogens, noble gasses, alkali metals, alkali earth metals, lanthanoides, actinoides, s-block, p-block, d-block, f-block

B) Atomic radius, ionic radius, ionization energy, electron affinity and electronegativity

For group A, determine where these are on a PT and mark them.

For group B, determine what the trend in these values are along a period and up or down a group, with a reason. Label the trend on the PT.

To think about, and answer (may require some looking up of information!) :

  1. why is the trend in atomic radius not the same as the trend in ionic radius?
  2. what are the differences/similarities between electron affinity and electronegativity?
  3. why do different sources disagree on which elements exactly are metalloids (sometimes called semi-metals)?
  4. what are alternate periodic tables? Why do scientists make them? Which one(s) do you like?

Leave a Reply