Elements with 1,2 or 3 valence electrons are usually metals and good electrical conductors while elements such as silicon and germanium with four electrons are semi conductors.
(Elements with 1,2 or 3 valence electrons; are usually; metals and good electrical conductors) (elements such as silicon and germanium with four electrons; are; semi conductors)
Elements with 1,2 or 3 valence electrons elements such as silicon and germanium with four electrons
are usually are
metals and good electrical conductors
semi conductors