A) What are the postulates of Bohr's model of an atom??
(b) Show diagrammatically the electron distributions in Sodium, Lithium and Aluminium atoms

a) As I remember "the atomic spectra" of bohr

1- Existence of a positively charged nuclei in the centre of the atom

2- Number of negatively charged electrons = number of positive charges ported by the atom.

3- Electrons navigate in fixed energy levels , with a high speed without gain or loose energy

4- centrifugal force is in equilibrium with attraction force.

5- The empty space between energy levels is forbidden for electrons.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

the answer would be b i believe