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.
a) Me20=1s2 2s2 2p6 3s2 3p6 4s2 or Me20=2)8)8)2) The valence electron is 2 b)It is metal- Ca [tex]c) \: {Ca}^{ + 2} \: and \: {Cl}^{ - 1} \\ form \: CaCl2 \: compound \\ [/tex]
d) it is more reactive than Mg Becayse, Calcium electropositive than magnesium
