hi . element X melts at a temperature lower than that of boiling water. it fails to react with hydrochloric acid and 1centimeter cube (1 cm^3) of the element has a mass of 1.8g. identify element X as a metal or a non metal. Give reasons to justify your answer. thank you
ALKALI metals: - 1 valence electron, so highly reactive - soft metals - silvery in color - low boiling and melting points - large atomic radi ALKALINE metals: - have 2 valence electrons, still very reactive - shiny, silvery-white colour - when heated in flame, Mg gives a brilliant white flame, Ca a brick-red, Sr a crimson, and Ba an apple green - harder and denser than sodium and potassium, and have higher melting points - found combined with oxygen and other non metals in earth's crust TRANSITION metals: - are electric conductors - have luster - malleable - most are hard solids with relatively high melting and boiling points - because of unpaired d electrons, they can have oxidation numbers of +4, +5, etc.
