The atomic number of an element is 20. (a) write its electronic configuration and determine its valency. (b) is it a metal or a non-metal ? (c) write the formula of its chloride. (d) is it more reactive or less reactive than mg (atomic number 12) ? give reason for your answer.

Suggest which functional groups are responsible for the reactions with(i) sodium,(ii) bromine water(iii) alkaline aqueous iodine.(3 marks)(iv) suggest structures for x and y.(1 mark)(b) one molecule that has been found in the dust clouds is hydroxyethanal: hoch2cho.name the two functional groups present in this compound.(2 marks)(c) but-1-ene, ch3ch2ch=ch2, is an important compound in the petrochemical industry.some reactions of but-l-ene are given below. in each empty box, draw the structural formulaand write the name of the organic compounds formed.