Please wait...
1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days
8104911739
For Business Enquiry

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this toll free number

022-62211530

Mon to Sat - 11 AM to 8 PM

if an atom is given to us, for ex: Mg then how do we find its no of electrons?

Asked by DEBJYOTI DEBNATH 1st February 2011, 12:00 AM
Answered by Expert
Answer:
Dear Student
 
Number of electrons are always same as number of protons.

Number of protons = Atomic number

Number of electrons = Atomic number minus the charge (if it is ion) 

Number of neutrons = Mass number minus Atomic number

The number of electrons in an element can change. For a neutral atom (net charge of zero), the number of protons is exactly equal to the number of electrons. So the number of electrons is also the same as the atomic number. 

However, it is possible to remove electrons and not change the identity of an element. These are called ions. The charge on the ion tells you the number of electrons -- the number of electrons is the atomic number minus the charge on the ion if it's an ion. If the charge is positive, subtract that number from the atomic number to get the number of electrons (with a positively charged ion, you will then have less electrons than protons). 

If the charge is negative, subtract the charge (but note you are subtracting a negative number, which is the same as adding the magnitude of the charge to the atomic number (with a negatively charged ion, you with then have more electrons than protons).




We hope that clarifies your query.
Regards
Team
Topperlearning
Answered by Expert 1st February 2011, 9:55 AM
Rate this answer
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Your answer has been posted successfully!

Chat with us on WhatsApp