1.
In Mendeleev's periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?
2.
The elements A, B, C, D and E have atomic number 9, 11.17 12 and 13 respectively. Which pair of elements belong to the same group?
3.
How many naturally occurring elements present in the modern periodic table?
4.
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
5.
Which of the following statements about the modern periodic table is correct?
6.
Which of the following elements will form an acidic oxide?
7.
An element which is an essential constituent of all organic compounds belongs to
8.
What type of oxide would Eka-aluminium form?
9.
Upto which element, the Law of Octaves was found to be applicable:
10.
Which of the following set of elements is written in order of their increasing metallic character
