NCERT Exemplar Solutions Class 9 Science Solutions for Structure of the Atom - Exercise in Chapter 4 - Structure of the Atom

Question 46 Structure of the Atom - Exercise

Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.


Atomic number of sodium (Z) =11 Mass number of sodium (A) = 23

Number of protons in the nucleus = 11 Number of neutrons in the nucleus =23-11 = 12

Number of electrons = 11

Electronic configuration of Na-atom = 2, 8, 1(K,L,M)

Na+ ion is formed from sodium atom by loss of an electron (present in the outermost shell). Hence,

the electronic configuration is 2, 8(K, L). However, the number of protons and neutrons remains the same.

Science Exemplar Problems - class 9 chapter Structure of the Atom Question 46 Solution image

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