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a) Write the electronic configuration of...

a) Write the electronic configuration of chromium `Cr_24` and copper
b) Which type of elements is possible for the electronic configuration [Ar] `3d^2 4s^2`

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`a. Cr_24 - [Ar] 3d^5 4s^1`
`Cu_29 - [Ar] 3d^10 4s^1`
b. Transition elements
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