| A | B |
|---|
| The section made of Groups 1 and 2, plus 13-18 are called | representative elements |
| How did Mosely arrange elements on the Periodic table | arranged by atomic number |
| Some elements are placed at the bottom of the table they are called the | inner transition elements |
| non-metals that are essential for life | carbon, sulfur, nitrogen, oxygen, phosphorous, and iodine |
| Who published first version of periodic table | mendeleev |
| atomic number is | number of protons in an element |
| elements in groups 3-12 are called | transition elements |
| What is group in the table | family of elements with similar physical or chemical properties |
