helium atomic spectra

The rules used for the calculation of oxidation number of an atom in a molecule are: The oxidation number of an element in the free or elementary state is always zero. For example, oxidation numbers of helium in He, hydrogen in H 2 , oxygen in O 2 , iron in Fe, bromine in Br ..

Atomic Properties Electronic Configuration - The relative abundance of noble gases along with their electronic configurations is given in the table. Electronic configurations of noble gases Element Symbol Atomic No. Electronic Configuration Abundance In Earth’s Crust (in p..

Name and Symbol Atomic no.(Z) Mass no.(A) Sub Atomic Particals Electronic configuration Valency Metal/Non-metal or Noble gases and Nature of element K L M N Hydrogen (H) 1 1 p = 1 e = 1 n = 0 1 &pl..

This molecule contains three electrons, two from one helium atom and one from the other helium (He + ) ion. The molecular orbital electronic configuration of the molecule is: Its bond dissociation energy has been found to be 242 kJ mol - 1 . The..

. As the radiating energy of a revolving electron (according to classical electromagnetic theory) continuously decreases the electron should follow a spiral path and fall into the nucleus. So this atomic model could not account for the stability of the atom. The observed sp..

where 'h' is a constant called 'Planck's constant' and is the frequency of radiation absorbed or emitted. The value of 'h' is 6.626x10 -34 J s -1 . The absorption and emission of light due to electron jumps are measured by use of spectrometers. This model of the atom was able to explain t..

Thomson's Model - According to this model, an atom can be considered as a sphere of uniformly distributed positive charge in which there are electrons distributed symmetrically. The electrons must be held by the positive charges by electrostatic forces. The mutual repulsions between the e..

A hydrogen atom has only one electron in its valence shell. It needs one more electron to fill its valence shell. The completed shell has the electronic arrangement of the noble gas helium, yet an octet is not completed. However we still get a stable molecul..

In order to understand the origin of these forces, consider two helium atoms very close to each other. The ground state electronic configuration of helium is 1s 2 .Each helium atom is uncharged because its electron cloud is symmetrically distribut..