why the transition elements have their two outermost shells incomplete?

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Solution

Electronic configuration of an element is based on the atomic number of the element. Depending on the number of electrons present in an element filling of the shells takes place. Therefore based on that we can write find out that which elements has which shells filled, partially filled or empty.

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(a) three elements that have a single electron in their outermost shells.

(b) two elements that have two electrons in their outermost shells.

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1. Three elements having a single electron in their outermost shell.

2. Three elements with filled outermost shell.

3. Three elements having 7 electrons in their outermost shell.

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