Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति
JEE Main & Advanced
Chemistry
Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति
Question Bank
Extended or long form of periodic table
question_answer
\[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}\] is the electronic configuration of the metal [RPET 2000]
A)\[Na\]
B)\[Mg\]
C)\[Fe\]
D)\[Al\]
Correct Answer:
B
Solution :
On equating no. of \[{{e}^{-}}\]?s atomic no. is 12 which is for \[Mg\].