Which of the following statement is correct for the ionization energy of elements?
I. It decreases as atomic radii increase.
II.It is inversely proportional to the principal quantum number.
III.It is directly proportional to the principal quantum number.
(a) 1 only
(b) 1 and 2
(c) 2 and 3
(d) 3 only

Which of the following sets of quantum numbers is correct for an electron in 3d-orbital?

A: According to Bohr's atomic model the ratio of angular momenta of an electron in first excited state and in ground state is 2:1 . In a Bohr's atom the angular momentum of the electron is directly proportional to the principal quantum number.

Which of the following statement is true regarding Bohr's model of hydrogen atom ? (I) Orbiting speed of electrons decreases as if falls to discrete orbits away from the nuclues. (II) Radii of allowed orbits of electrons are proportional to the principle quantum number. (III) Frequency with which electrons orbit around the nucleus in discrete orbits is inversely proportional to the principle quantum number. (IV) Binding froce with which the elctron is bound to the nuclues increases as it shifts to outer orbits. Selected the correct answer using the codes given below:

The maximum of electrons can have principal quantum number n = 3 and spin quantum number m_(s) = 1//2 is

Which ofthe following curves may represent the energy of electron in hydrogen atom as a function of principal quantum number n:

Which of the following electrons should generally have the highest value of ionization energy (for the same value of the principal quantum number)