Define the terms: i proton neutron iii electron. b An atom X has a proton number of 19 and relative atomic mass of 39. i How many electrons, protons and neutrons are there in atom X? ii How many electrons will there be in the outer electron shell of atom X? iii What is the electronic configuration of atom X?

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.