Q. 63.6( 9 Votes )

Write down the characteristics of the elements having atomic number 17.

Electronic configuration ………………………….

Period number ………………………….

Group number ………………………….

Element family ………………………….

No. of valence electrons ………………………….

Valency ………………………….

Metal or non-Metal ………………………….

Answer :

a. The electronic configuration of the element (Z=17) is:


1s2 2s2 2p6 3s2 3p5


b. Period number = 7


As the element has 7 electrons in the outermost shell (3s2 3p5). Hence, it belongs to period 7.


c. Group number = 3


In the element (1s2 2s2 2p6 3s2 3p5), 3 is the highest principal quantum number. Hence, it belongs to third period.


d. Element family = p-block element


The element belongs to group 3 and period 7, this means it is located at the right side of the periodic table. Hence, it belongs to p-block family.


e. Valence electrons = 7


The element (1s2 2s2 2p6 3s2 3p5) has 7 valence electrons, i.e., electrons in the outermost shell (3s2 3p5).


f. Valency = 1


The valency is the number of electrons needed to complete the octet. So the element (2,8,7) need only one electron to achieve noble gas configuration (2,8,8)


g. Non-metal


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