1. | Modern Periodic law is based upon ? | |
2. | Which one of the following elements exhibit the maximum number of valence electrons ? | |
3. | The modern periodic table is given by ________ ? | |
4. | The least reactive element in group 17 is ___________ ? | |
5. | The number of electrons in the valence shell is equal to its ________ ? | |
6. | Which of the following is non-metal and to which group does it belong ? | |
7. | Which of the following set of elements is written in order of their increasing metallic character ? | |
8. | What is the atomic number of element of period 3 and group 17 of the Periodic Table ? | |
9. | Upto which element, the Law of Octaves was found applicable ? | |
10. | Which of the following is most reactive ? | |