The basic difference between Mendeleev’s Periodic Law (A) and Modern Periodic Law (B) is:

The formula for the oxide formed by Eka-aluminum is:

1. ${\mathrm{EO}}_4$

2. ${\mathrm{E}}_2{\mathrm{O}}_3$

3. ${\mathrm{E}}_3{\mathrm{O}}_2$

4. EO

The basic theme of the periodic table is:

Those in a group that falls under the law of triads include:

1. Cl, Br, I

2. C, N, O

3. Na, K, Rb

4. H, O, N

Eka aluminium and Eka silicon are now known as:

An example of metalloid elements in the periodic table is:

 All the non-metals in the long form of the periodic table are placed under:

1. s-Block

2. p-Block

3. f-Block

4. d-Block

The element named after Lawrence Berkeley Laboratory is: 

Among the following elements whose atomic numbers are given below, which cannot be accommodated in the present set up of the long periodic table?

Among the following elements, the one that is not an actinoid is: