The atomic number of X is 17, predict its a. Valency b. Formula of its halide c. Type of ion formed d. Reactivity with respect to the other of same group
X’ has atomic number 17 ∴ Electronic configuration → 2 8 7 a Valency = 1 b Formula of halide = HX c Type of ion formed = Negative ion Anion. d Reactivity = Most reactive among those elements which lie below X in a group.
