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.

Question

Two electrons are moving in orbits of two hydrogen like atoms with speeds $3\times10^{5}\,\text{m/s}$ and $2.5\times10^{5}\,\text{m/s}$ respectively. If the radii of these orbits are nearly same then the possible order of energy states are ___ respectively.

Answer 1

Given:

Number of electrons = 29
Number of neutrons = 35

(i) Number of protons

For a neutral atom:

Number of protons = Number of electrons

Number of protons = 29

(ii) Electronic configuration of the element

Atomic number = 29

Element with atomic number 29 is Copper (Cu).

The electronic configuration of copper is:

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹

(or)

[Ar] 3d¹⁰ 4s¹

Final Answer:

(i) Number of protons = 29
(ii) Electronic configuration = [Ar] 3d¹⁰ 4s¹

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 and Explanation

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