Then, in groups, we looked at some of these trends more closely- discussing what they mean, their pattern, and the causes for these patterns. Specifically we mentioned attraction, distance, shielding, effective nuclear charge, and stability of the configuration. We looked at the impact, if any, of these factors pertaining to ionization energy trends, atomic/ionic size trends, and electronegativity/electron affinity trends.
The next thing we did was observe reactions of lithium and sodium in water as an example for the reactivity of alkali metals. We then talked about how alkali metals and halogens are the most reactive elements because they are both only one electron away from a full outer shell.
After that we received handouts for a series of presentations on periodicity, and worked on that for a short while until the end of the session.
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