An atom of an element contains 29 electrons ...

NCERT Class XI Chemistry Structure of Atom Solutions

Question : 26 of 67

Marks: +1, -0

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.

Solution:

Number of electrons = 29, number of neutrons = 35

(i) We know that Z = e = p

Since e = 29

∴ p = 29

(ii) Electronic configuration :

1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1

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