The Precursors Of Modern Human Beings And Modern Human Beings
The electronic configuration of an element is 2, 8, 4. State its, (a) group and period in the Modern Periodic Table. (b) name and write its one physical property.
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?
