State two postulates of Bohr atom model

State the postulates of Bohr's model of hydrogen atom .

State the postulates of Bohr's model of hydrogen atom .

(i) State the postulates of bohr's atomic theory. (ii) Write the symbols of two anions isoelectronic with K^(+) .

Using Bohr's postulates of the atomic model, derive the expression for radius of n-th electron orbit. Hence obtain the expression for Bohr's radius.

Write two limitations of Bohr’s atomic model.

State the postulates of reaciton rate. What is temperature co-efficient of a reaction.

Write two defects.of Bohr atom model. Concept of which quantum number comes form Sommerfield theory?

Using Bohr's porstulates of atomic model, derive the expression for the radius of the n^(th) orbit.

Prove with help of postulate of Bohr's theory that the velocity of an electron revolving in the first orbit of a hydrogen- like atom or ion is double of that revolving in the second orbit .

(i) What is the orbital angular momentum of a p-electron in (h)/(2pi) unit? (ii) (a) Atomic number of two elements X and Y are 15 and 27 respectively. Write down the electronic configuration of X^(3-) and Y^(3+) ions- (b) State two limitations of Bohr's theory of H-atom.