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: 8
        
Why is 1/12th the weight of carbon 12 isotope used to calculate relative atomic mass
one year ago

Answers : (1)

Wajahat Wajid Khan
33 Points
							
I assume you mean as the definition of an atomic unit. Since protons and neutrons have slightly different weights, and average of the two is used to determine an atomic unit. Carbon-12 is the most common and readily available isotope to have exactly the same number of protons and neutrons, 6 of each, and thus provides a perfect average when divided by the total number of protons and neutrons. (Carbon-12 also has 6 electrons, but the mass of an electron is so small as to be considered negligible).  Dividing by 12 allows even the smallest atom, hydrogen, to have a mass that is a whole number, rather than a fraction.

There are several atoms smaller than carbon-12 with the same number of protons and neutrons, (for example, dueterium, the hydrogen isotope present in heavy water), but they are much less common. By setting the most common isotope of carbon as the standard, it insures that it is readily available to anyone who needs access to it. Hope this helps!
one year ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Get Extra Rs. 1,590 off

COUPON CODE: SELF10


Course Features

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


Course Features

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


Get Extra Rs. 1,590 off

COUPON CODE: SELF10

Ask Experts

Have any Question? Ask Experts

Post Question

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