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Valency

An atom ofan ...

Question

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

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Solution

(i) For an atom to be neutral, the number of protons is equalto the number of electrons.
∴ Number of protons in the atom of the given element = 29
(ii) Theelectronic configuration of the atom is
1s²2s² 2p⁶ 3s² 3p⁶4s² 3d¹⁰.

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