The atom of an element X has 7 electrons in its M shell
(a) Write the electronic configuration of element X.
(b) What is the atomic number of element X ?
(c) Is it a metal or a non-metal
(d) What type of ion will be formed by an atom of element X ? Write the symbol of the ion formed
(e) What could element X be ?

Answer

(a) underset("2, 8, 7")("K L M")` (b) 17 (c) Non-metal (d) Anion (Negative ion) ; `X^(-)` (e) Chlorine (Cl)