In this worksheet, students practice some basic skills surrounding atoms. How many protons, neutrons, or electrons do they have? What are their atomic masses and atomic numbers?
They practice these skills by filling information into a table. I have provided some of the information, and they need to use it to fill in the blanks. For instance, if I state that an element has 20 protons, its atomic number must be 20.
Students are then asked to use their periodic tables to collect the same information for several other elements (ones that aren't included in the first part of the worksheet).
In this way, students learn to use the periodic table to collect this information, as well as how to use information they know about an element to figure out the missing parts.
On the back of the worksheet, they're tasked with drawing Bohr models of a few atoms (only the first two electron levels), then identify how many valence electrons the element has.
This is a great worksheet for basic chemistry skills, either in middle school, or 9th grade physical science, or perhaps even chemistry, as a refresher/check.