1. The periodic table was first arranged by?
2. The modern periodic table is arranged according to?
3. The horizontal rows in the periodic table are called?
4. The vertical columns in the periodic table are called?
5. How many periods are present in the modern periodic table?
6. How many groups are present in the modern periodic table?
7. Elements in the same group have?
8. The first element of the periodic table is?
9. The last element in the periodic table is?
10. Elements in Group 1 are called?
11. Elements in Group 17 are called?
12. Elements in Group 18 are known as?
13. Which block of elements is located in the center of the periodic table?
14. The periodic table helps scientists to?
15. Metals are generally located on the?
16. Non-metals are mostly found on the?
17. The staircase line in the periodic table separates?
18. Elements with properties of both metals and non-metals are called?
19. The element sodium belongs to which group?
20. The periodic table is useful because it?
