Structure of At...

The ratio of masses of an element A attached with the fixed mass of another element B in their two compounds is 2: 3. If 48 mass of A is attached with 24 mass of B in first compound then what mass of A is attached with the 12 mass of b in the second compound?

Aufbau principle does not give the correct arrangement of filling up of atomic orbital's in

One Bohr magneton is equal to ____________ $${ AM }^{ 2 }$$.

The de Broglie wavelength of an electron in $$n^{th}$$ Bohr orbit of radius $$a_n(a_0$$ being the first orbit radius$$)$$:

The ground state energy of hydrogen atom is $$-13.6$$ eV. The energy of second excited state $$He^+ ion$$ in eV is:

The number of the spectral lines obtained when an electron is provided with a photon of the energy of $$11\  eV$$ (for H atom) is/are:

Which of the following are isotopes?
(i) Atom, whose nucleus contains 20p+15n
(ii) Atom whose nucleus contains 20p+17n
(iii) Atom, whose nucleus contains 18p+22n
(iv) Atom, whose nucleus contains 18p+21n

According to Moseley's law, the ratio of the slope of graph between $$\sqrt { f } $$ and $$Z$$ for $${ k }_{ \beta  }$$ and $${ k }_{ \alpha  }$$ is

From atomic number 58 to 71, elements are placed in :-

The magnetic field at the center of a hydrogen atom due to the motion of electron varies with the principal quantum number as