Structure of At...

The equivalent weight of a metal is 4.5 and the molecular weight of its chloride is 80. Find the atomic weight of the metal.

The electric potential between a proton and an electron is given by $$V=VIn\dfrac { r }{ { r }_{ 0 } } $$, where $${ r }_{ 0 }$$ is a constant. Assuming Bohr's model to be applicable,write variation of $${ r }_{ n}$$ with $$n,\ n$$ being the principal quantum number.

For an atom with atomic number 14, the number of orbits and orbitals in which electrons are present is respectively:

Imagine an atom made of a proton and a hypothetical particle of double the mass as that of an electron but the same charge. Apply Bohr theory to consider transitions of the hypothetical particle to the ground state . Then, the longest wavelength (in terms of Rydberge constant for hydrogen atom ) is

Which of the following elements has two shells, both of which are completely filled with electrons? 

After the filling of np-orbitals next orbital filled will be:

The hydrogen atom in ground state is excited by a monochromatic radiation of $$  \lambda=975 A^{\circ}  $$ . Number of spectral lines in the resulting spectrum emitted will be

A radioactive element $$X$$ converts into another stable element $$Y .$$ Half-life of $$X$$ is 2$$h$$ . Initially,only $$X$$ is present. After time $$t$$ , the ratio of atoms of $$X$$ and $$Y$$ is found to be $$1 : 4 .$$ Then $$t$$ inhours is 

Calculate minimum number of electrons in $$Fe$$ atom having $$(n+l) \ge 4,\ m=-1, \ s=+\frac { 1 }{ 2 } $$.

If mass of one atom is $$3.32\times { 10 }^{ -23 }g$$, then calculate no. of nucleons present in 2 atoms of the element :