question_answer 45)

An atom of an element contains 29 electrons and 35 neutrons. Deduce: (i) the number of protons and (ii) the electronic configuration of the element.

Answer:

(i) Number of protons = Number of electrons = 29 (ii) Electronic configuration \[=1{{s}^{2}}.2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},4{{s}^{2}}3{{d}^{9}}\] \[=1{{s}^{2}}.2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},3{{d}^{9}},4{{s}^{2}}\] \[=1{{s}^{2}}.2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},3{{d}^{10}},4{{s}^{1}}\]