Question

1. the properties of unknown elements belonging to a periodic table family/group are described in the box below: properties of an unknown group of elements - soft silvery - white color - good conductor of thermal energy - good conductor of electricity - atoms contain a single valence electron the properties above best describe which family/group of the periodic table? noble gases halogens alkaline earth metals alkali metals

Explanation:

Alkali metals have a single valence - electron, are soft, silvery - white, good conductors of heat and electricity. Noble gases have full valence shells. Halogens have 7 valence electrons. Alkaline earth metals have 2 valence electrons.

Answer:

Alkali metals