Choose the correct pair of elements based on the same number of electrons present in their outermost shell.

Hydrogen and beryllium

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Carbon and aluminium

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Boron and magnesium

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Hydrogen and sodium

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Solution

The correct option is D Hydrogen and sodium
From the electronic configurations of hydrogen (1) and sodium (2,8,1), we can see that hydrogen and sodium are the only pair which have one electron in their outermost shell. Hence the answer is hydrogen and sodium.

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Similar questions

Name:

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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(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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