"CK-12.org is a non-profit organization dedicated to education. Their website offers a large collection of resources for students and teachers like Brain Genie which I previously shared. The bulk of their resources are math and science centered where students can learn about chemistry, physics, algebra, and geometry just to name four. They also offer resources for other content areas as well including history, English, and SAT prep. Their website is free to join and offers a wealth of learning resources and activities. Their site offers articles, quizzes, interactive lessons, videos and students can keep track of their learning as they complete lessons and activities and members can upload their own resources to the site as well. "
This looks like a good attempt to crowd-source materials for K-12 in the U.S. Could have uses for ESL/EFL, particularly with content- and project-based learning.
These lessons include Scholastic's Interactive Weather Maker, showing how humidity and temperature levels relate to rain and snow storms; Bytesize Science on the chemistry of snowflake making; and why the full moon gives more light in winter. Video explanations are embedded in R. Byrne's site.
A video with a little history and discussion of the use of the element should help students remember them better. Accompanying lessons for each element as well.