Question

Write the electron-dot structures for sodium, oxygen and
magnesium
Show the formation of Na, O and MgO by the transfer of electro
What are the ions present in these compounds?
Why do ionic compounds have high melting points?​

Answer 1

Answer:

(i) The representation of elements with valence electrons as dots around the elements is referred to as electron-dot structure for elements.

Electronic configuration of Sodium (Na)→2,8,1

Electron dot structure =  

Na

∙

 

Electronic configuration of Oxygen (O)→2,6

Electron dot structure =∙  

∙∙

O

∙∙

 

​  

∙

Electronic configuration of Magnesium (Mg)→2,8,2

Electron dot structure =  

Mg

∙∙

​  

 

(ii) Ionic compounds have strong electrostatic forces of attraction between the ions. It requires a lot of energy to overcome these forces. Thus ionic compounds have high melting points.