The maximum number of electrons allowed in the fourth energy level of an h atom is

The fourth energy can hold up to 32 electrons, 2 in s orbitals, 6 in p orbitals, 10 in d orbitals,and 14 in F orbitals 

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.