A stock solution of copper (1000 ppm) is available. prepare 50 mL each of five standard solutions, giving the amount of the 1000 ppm solution required for each one and how you would proceed with the preparation, including the kind of pipet needed. The concentrations of the standard solutions should be 1, 2, 3, 4 and 5 ppm

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

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