Question

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Question : Explain the trends of Valency, atomic size and metallic and non-metalic character of element Present in Modern Periodic Table.

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Answer 1

the valexy of am elelment is determined by the no. of electorlns presebt in the outermost shell of its atom is called valency trends

2
atomic size-the size of the atom is indicated by its radius. atomic radius is the distance between the nucleus of the atom and its outermost shell .
3 it is seen taht the metallic elements like na, mg, are toward left .the non metallic element such as sulphur chlorine at words right .the metallic element Silicon lies in between these two types of similar pattern is also observed in the other periods .

Answer 2

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➡VALENCY

✴In a group..

✔In a group the valence electrons remains same.

Like in group 1..
Li, No K, Rb, Cs, Fr are having same valence electron which is +1.

✴In a period...

✔In a period the valence electrons increases by one as we move left to right.

Like in period 1
The valence electron increases by one
Li =1,Be=2,B=3,C=4,N=5,O=6,F=7.

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➡METALLIC AND NON METALLIC CHARACTER.

✴In a group

✔Moving towards the bottom the mettalic character increases.
✔Moving towards the bottom non metallic character decreases.

✴In a period

✔Moving left to right in a period mettalic character decreases.
✔Moving left to right in a period non metallic character increases.

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➡ATOMIC SIZE.

✔In a group

The atomic size increase moving downwards in a group due to increase in valency shells.

✔In a period

The atomic size decreases till the halogens group 17 while the members of group 18 ..noble gases.. have the biggest atomic size.

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✌(*＾3＾)✌HOPE IT HELPS ✌(｡’▽’｡)✌

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