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

Home / Doubts and Solutions/CBSE/Class 10

What does the "first series","second series" and "A", "B" stand for in the Mendeleev's periodic table?

Asked by Isha B 25th January 2014, 12:42 PM
Answered by Expert
Answer:
Hi Isha, Mendeleev's periodic table contains eight vertical columns of elements called 'groups' and seven horizontal rows called 'periods', Each group has two sub-groups A and B. The properties of elements of a sub-group resemble each other more markedly than the properties of those between the elements of the two sub-groups. First series and second series are periods.
Answered by Expert 30th January 2014, 5:13 PM
Rate this answer
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Report an issue
Previous Question
Next Question
Your answer has been posted successfully!

Free related questions

ü  In an ac electric generator the current flow is reversed every half revolution which means that if the current in the first half flows from A to B in the upward direction and from C to D in the downward direction hen in the second half the positions and current flow is interchanged by the two arms AB and CD. Now applying Fleming’s right hand rule we get the current to be flowing and passing through CD and then AB. The same change in the direction takes place in case of electric motor. So can the motor be called AC Motor?  If yes then we all know that electrical devices like the radios, televisions, stereo sets, etc work on dc but not ac, then how is the motors in them designed?

5th December 2017, 7:13 PM
how to make a  science working model project on topic a hand cart with steering wheel and brakes that works on principle of alternate sources of energy?please give me some idea on physics principle which will me to make brakes of hand cart which will based on alternative source of energy.
6th December 2017, 3:58 PM
RELATED STUDY RESOURCES :
CBSE Class-10 QUESTION ANSWERS

Browse free questions and answers by Chapters

Trending Tags

arithmetic progression linear equations area tips and tricks volume solution of the equation trigonometric ratios circle integration trigonometric equations

Latest Questions

CBSE XII Science Physics
A wire of length l is bent in the form of a circular loop with a no of turns and is suspended in a magnetic field of intensity B. Find the expression for the maximum torque produced on the circular loop when a current I is passed through it. 
Asked by mridulabarua05 20th February 2019, 5:08 PM
CBSE XII Science Physics
Two metal spheres each of mass 1 gmail and radius 0.5 cm are placed on a smooth horizontal insulated plate such that their centres are 15 cm apart. One is charged to a potential of 500 volt and the other to 100 volt. What is the velocity of each sphere when they drift away to a distance of 30 cm between their centres?
Asked by mridulabarua05 20th February 2019, 5:02 PM
CBSE XII Science Physics
Show that the angle of deviation will be minimum when a light ray passes through a prism symmetrically. 
Asked by mridulabarua05 20th February 2019, 4:57 PM

Chat with us on WhatsApp