Why is large part of the atom (i.e.) extra nuclear part neglected when calculating the mass of the atom?

Calculate the mass of oxygen atom in amu.

Average atom of an element is calculated by adding the masses of its _______.

Why does not the atomic mass of an element represemt the actual mass of its atom ?

Shows a vessel partitioned by a fixed diathermoc separator. Different ideal gases are filled in the two parts. The rms speed of the molecules in the left part is the mean speed of the molecules in the right part. Calculate the ratio of the mass of a molecule in the left part to the mass of a molecule in thej right part.

Calculate the effective nuclear charge experienced by the 4s electron in potassium atom .

Calculate the effective nuclear charge experienced by the 4s electron in potassium atom.

When a photon is emited by a hydrogen atom , the photon carries a momentum with it (a) calculate the momentum carreied by the photon when a hydrogen atom emits light of wavelength 656.3 nm (b) with what speed does the atoms recoil during this transition? Take the mass of the hydrogen atom = 1.67 xx 10^(-27) kg (c ) Find the kinetic energy of recoil of the atom

Express one joule in eV. Taking 1 amu = 931 MeV. Calculate the mass of C-12 atom.

Using Slater's rule calculate the effective nuclear charge on a 3p electron in aluminium and chlorine .Explain how these results relate to the atomic radii of the two atoms.