What is so special about the combination e/m? Why do we not simply talk of e and m specially?

What is special about lungs of birds?

What is special about tissue present is heart?

Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element ?

The electronic configuration of an element Z is 2, 8, 8. (d) What is special about the outermost electron shell of the atom of this element ?

What was special about symbols of elements given by Berzelius ?

What is the special point about prism binoculars,though it is a pair of astronomical telescopes?

What factors govern the direction of e.m.f. ?