A part of the periodic table is given below. The elements sodium, carbon, chlorine and argon have been placed in their correct positions. The positions of other elements are represented by hypothetical letters.

With reference to the table answer the following
Which of these has electronic configuraiton (2,8,4)?

Predict the position of the element in periodic table have the electronic configuration (n-1)d1 ns2 n=4

The following tables shows the position of six elements A, B, C, D, E and F in the periodic table? Using the above table answer the following question: which element is a metal with valency 2 ?

The following tables shows the position of six elements A, B, C, D, E ,and F in the periodic table? Using the table answer the following question:Out of D and E, which one has a bigger atmic radius and why?

An element has the electronic configuration 2,8,8,2 indicate its group and period in the modern periodic table?

Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. Silicon that has been dopend with group - 15 elements is called :

Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. Silicon that has been dopend with group - 13 elements is called :