Question Text
Question 4 :
The zigzag line in the periodic table separates ....... from .............
Question 5 :
Which of the following triads does not follow Dobereiner's law of triads?
Question 7 :
An element belongs to the 3rd period and Group II of the periodic table.<br/>Name of the element is ________.
Question 8 :
The long form of the periodic table consists of ___ horizontal rows and ___vertical columns.
Question 10 :
If X and Y are two elements which belong to same group of Newland's periodic table, how many elements exists between X and Y?
Question 11 :
The elements $A, B, C, D\ and \ E $ have atomic number 9, 11,17,12 and 13, respectively. Which pair of elements belongs to the same group?
Question 12 :
Atomic number of an element is 16. What is the nature of the element?
Question 13 :
In the modern periodic table, a zig-zag line separates metals from non-metals. the borderline elements -boron , silicon , germanium ,arsenic , antimony, tellurium and polonium are intermediate in properties and are called metalloids or semimetals 
Question 15 :
Where would you locate the element with electronic configuration 2,8 in the modem period table?