Which of the following elements will have same number of electrons in its outermost shell when compared to the element having atomic number 17.

Lithium

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Fluorine

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Sodium

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Neon

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Solution

The correct option is B Fluorine
Chlorine is the element which has atomic number 17. It has electronic configuration of (2,8,7) from which we can say it has 7 electrons in its outermost shell.
From the given options, fluorine (2,7) is the only element having same number of electrons in its outermost shell.

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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.

Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

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