How are the shells in an atom designated?

How is the mass of an atom accounted for?

Each shell in an atom is usually represented by a number represented as:

How is the small intestine designed to assimilate the food? explain.

How are quantum numbers useful to designate orbitals?

How is the small intestine designed to absorb digested food? Explain.

How are the lungs designed in human beings to maximise the area for exchange of gases?

How many electrons are present in the M shell of an atom odf an el,ement with atomic number (z)24?

The maximum number of electrons that can be accommodated in the L-shell of an atom is

The phenomenon of intermixing of atomic orbitals of equal energy which are present in outer shells of atom is called

How many orbitals are there in the second orbit? How are they designated?