Give the general group study of hydrogen with reference
valence electrons

Give the general group study of hydrogen with reference burning

Give the general group study of hydrogen with reference reducing power.

What are valence electrons ?

Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.

Highest group valency of halogens with respect to oxygen is

An element X of group 15 and period 2 exists as diatomic molecule. It combines with hydrogen and forms ammonia in the presence of a suitable catalyst. Write the electronic configuration of X and count the number of valence electrons.

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. No. of valene electrons in silicon are :

Assertion:On moving down the group the group,ionization enthalpy decreases. Reason:With decreases in size of the atom,the force of attraction between the nucleus and valence electrons decreases.

An element with atomic number 5 belongs to III A group of the modern periodic table. Find the number of valence electrons

In the atomic spectrum of hydrogen, the spectral lines pertaining to electronic transition of n = 4 to n = 2 refers to