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An atom of an element contains 29 electrons and 35 neutrons. Deduce -

a. the number of protons 

b. the electronic configuration of that element.

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a. In an atom, number of protons is equal to number of electrons. 

The given atom contains 29 electrons. 

∴ Number of protons = 29

b. The electronic configuration of an atom of an element containing 29 electrons is :

1s2 2s2 2p6 3s2 3p6 4s1 3d10

[Note : Given element is copper (Cu) with Z = 29]

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