An excited hydrogen atom emits lift with a wavelength of 397.2nm to reach the energy level for which n=2 in what principal quantum level did the electron begin . (b) what is the number of electrons orbital s and the names of the subshells associated with the initial principal quantum level

Hydrogen is the most abundant element on the periodic table..hope it .

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.