which characteristic is given by the principal quantum number?\norbital size\norbital mass\norbital…

Brief Explanations:

The principal quantum number ($n$) in quantum - mechanics determines the energy level and the size of the orbital. Larger values of $n$ correspond to larger orbitals and higher energy levels. Orbital mass is not related to quantum numbers. The orbital shape is given by the angular - momentum quantum number ($l$), and the orbital orientation is given by the magnetic quantum number ($m_l$).

Answer:

orbital size