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Bohrs Atomic Model

Bohrs Atomic Model Scientist Neils Bohr gave some corrections to Rutherford's atomic model in 1913. This corrected model is called the Bohr's atomic model. The main postulates of this model are - a) The electron moves around the nucleus in a circular motion, about an axis. This circular motion is called an energy level or orbit. They are also known as the shell or permanent orbit or principal energy level. Electrons do not absorb or emit any energy when they revolve these fixed orbits. If we express the permanent orbit as n, then n = 1, 2, 3, 4, etc.  In other words, if n = 1, the principal energy level is K,  when n = 2, L is the principal energy level,  when n = 3, M is the principal energy level,  when n = 4, N is the principal energy level, etc. b) According to Bohr's model, the angular momentum of an electron in an energy level is mvr =  nh / 2𝜋 . Here, m = the mass of the electron (9.11×10 -31  kg) r = the radius of the orbit that the electron follows v = the veloc

How to make sandwiches

How to make sandwiches

Sandwiches are junk foods. They are of many kinds. Their making processes are also different. To make ordinary sandwiches first, the butter should be soft so that it will spread easily. So, we warm it if is cold. For picnic sandwiches, we use thick-sliced; for dainty ones, we use thin-cut. crusts may be removed or left on, according to taste. To keep sandwiches fresh, we wrap them in foil or polythene. fillings should be moist enough to spread easily, but not so moist as to make the bread soggy.

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