A list of all chemical elements known to mankind sorted by the number of protons they contain within the atom. There are 118 elements starting with hydrogen, which has one proton. The first 94 are ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...