Question

The atomic number of an element is 17. To which group and period does their element belong ? Determine its valency.

Answer 1

The group is 17, period is 3 and valency is 1.

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains.Thus for element with atomic number 17 contains 17 electrons.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration is :

$F:17:1s^22s^22p^63s^23p^5$

In the given configuration, 3 is the highest principle quantum number. Therefore, it belongs to the 3rd period in the periodic table.

As the element belongs to p-block, as last electron enters p orbital,  its group number = (10+valence electrons) = 10+7= 17.

Valency is the number of electrons it lose or gain in order to acquire stable configuration. The element gains 1 electron to acquire noble gas configuration. Thus valency is 1.

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Answer 2

Explanation:Electronic configuration represents the total number of electrons that a neutral element contains.Thus for element with atomic number 17 contains 17 electrons.The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration is :F:17:1s^22s^22p^63s^23p^5F:17:1s22s22p63s23p5In the given configuration, 3 is the highest principle quantum number. Therefore, it belongs to the 3rd period in the periodic table.As the element belongs to p-block, as last electron enters p orbital,  its group number = (10+valence electrons) = 10+7= 17.Valency is the number of electrons it lose or gain in order to acquire stable configuration. The element gains 1 electron to acquire noble gas configuration. Thus valency is 1.Learn More about elements

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