Question

group number and period number of cl

Answer 1

group no.. is 17 and period is 3.

Answer 2

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To find the position (group & period) of element in Periodic table and identify its properties. (Except Transition elements)

We already know that all the elements in periodic table are arranged serially according to their atomic numbers. There are 18 groups and 7 periods. The elements are arranged in such a way that the elements get categorized according to their properties.

Here we will work with only basic 8 groups (I A,II A,III A,IV A,V A,VI A,VII A and 0) .In the periodic table the first group (except Hydrogen) consists of strong Alkali Metals, the second group consists of Alkaline Earth Metals. The right of the periodic table consists of the non-metallic elements including noble gas and metalloid. The VII A groupis also known as the Halogen Family and its elements are known as halogens. All Noble Gasesare in the group 0. All these elements are collectively known as Normal Representative Element.



    1.      The period of element relates the number of shells of an atom of the given element.

    2.      The group is similar to the no of valence electrons of given element.

   3.      The valency is the no of electrons it accepts or donates. So in case of non-metals        valency = 8-valence electrons & in case of metals valency=valence electrons... This is B’COZ  non-metals accept so lacked electrons only considered.

    4.      The number of element in each period is calculated by 2n2.