NCERT Exercise 2.23 - Structure of Atom

Question: Write requested ion configurations and identify atoms from outer or abbreviated configurations.

Answer: H-: 1s2; Na+, O2- and F-: 1s2 2s2 2p6. 3s1 = Na, 2p3 = N, 3p5 = Cl; [He]2s1 = Li, [Ne]3s2 3p3 = P, [Ar]4s2 3d1 = Sc.

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