MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 11
        
cations are genrally smaller than the respective atom whereas the anions are generally larger ? illustrate with example . 
 
one year ago

Answers : (2)

Khimraj
3008 Points
							
Example
size of Na+ is smaller than Na.
size of O2- is greater than O.
Hope it clears....................
one year ago
Rajdeep
231 Points
							
HELLO THERE!
 
The answer to your question is relatively simple and does not need any high level knowledge.
 
Cations are smaller than their parent atom. A cation is formed when the parent atom (of a metal) loses electron(s), and hence becomes positively charged. However, the number of protons remain the same. So, the negative charge in the atom decreases while the positive charge remains the same (in the cation). This results in a greater nuclear pull on the valence shell of the cationdue to which the atomic radius (size of the cation) decreases. Hence, cations are smaller than parent atom.
 
Consider Iron as an example. When it loses 2 atoms to become Fe2+, size of Fe2+ is smaller than that of Fe. When it loses an electron more to become Fe3+, then the size of Fe3+ is less than that of Fe2+ (as nuclear pull on the valence shell of Fe3+ is more) and Fe.
 
Anions are generally larger than the parent atom. The reason is just the opposite. 
An anion is formed when the parent atom (of a non-metal) gains electron(s), and hence becomes negatively charged. However, the number of protons remain the same. So, the negative charge in the atom increases while the positive charge remains the same (in the anion). This creates a wobbling up of the atom (due to repulsion between the electrons), so the atom of anion increases in size. Hence, size of anion is larger than that of the parent atom.
 
Consider Chlorine as an example. When a chlorine atom loses an electron to form Cl- ion, size of Cl- is greater than that of a Cl atom.
 
 
HOPE IT IS CLEAR...
Thanks!
one year ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 141 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details