An Element “X” has 13 protons, 13 electrons and 14 neutrons. Answer the following questions: a) What is its atomic number of „X‟? b) Identify the element. c) What is its valency? What is the number of valence electrons is “x”? d) What is the type of ion formed by “X” ? Why? e) Name the scientists who discovered electrons and protons.
(a) Atomic No is 13 (b) Aluminium (c) its valency is 3 , Valence electrons = 3 (d) Electron was Discovered by JJ Thomson , Proton was Discovered by Goldstein
