First 20 Elements of the Periodic Table Diagram | Quizlet
SOLVED: 'These are the first 20 elements on the periodic table which of these elements had 20 protons in its nucleus (atomic number = 12)? 1. He 2. S 3. Mg 4.
A truncated version of the Periodic Table, showing Lewis Dot structures for the first 20 elements Hyd… | Chemistry lessons, Teaching chemistry, Chemistry worksheets