A K Srivastava Solutions for Chapter: Periodic Classification of Elements, Exercise 3: Practice Questions

An element '$\mathrm{X}$' belongs to the $3$rd period and group $16$ of the Modern Periodic Table. Determine the number of valence electrons and the valency of '$\mathrm{X}$'. 

An element '$\mathrm{X}$' belongs to the $3$rd period and group $16$ of the Modern Periodic Table. Write the molecular formula of the compound when '$\mathrm{X}$' reacts with hydrogen and write its electron dot structure. 

An element '$\mathrm{X}$' belongs to the $3$rd period and group $16$ of the Modern Periodic Table. Name the element '$\mathrm{X}$' and state whether it is metallic or non-metallic. 

The atomic number of two elements are given below: 

$11,15$

Identify the elements. 

The atomic number of two elements are given below: 

$11,15$

What would be the electronic configuration for each of these elements? 

The atomic number of two elements are given below: 

$11,15$ 

Identify the periods of these elements in the Periodic Table. 

The atomic number of two elements are given below: 

$11, 15$

Identify the group number of these elements in the Periodic Table. 

The atomic number of two elements are given below: 

$11,15$ 

Determine the valency of these elements.