The Alkali Metals Crossword Puzzle

QUESTIONS LIST: tarnish : this happens to the surface of an alkali metal when it reacts with oxygen, hydrogen : this gas is produced when an alkali metal reacts with water, melts : sodium _ into a ball when it reacts with water, lilac : potassium burns with a _ flame, less dense : group 1 metals float because they are _ _ than water, oil : these metals are stored in _ , sodium hydroxide : this is formed when sodium reacts with water, corrosive : lithium, sodium and potassium are _ , skate : the alkali metals _ across the surface of the water, universal indicator : when this is added to an alkaline solution it turns blue or purple.