Question

write periodic trends in valence ​

Answer 1

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Periodic trends in valency: Valency of the main group elements is usually equal to the number of valence electrons (outer electrons) and/or equal to difference between 8 and the number of valence electrons. shows the periodic trends in the valency of main group elements by taking examples of hydrides and some oxides. As may be notice form that the valency remains the same down the group and shows a gradual variation across the period as atomic number increases from left to right.

Answer 2

Explanation:

sometimes, it is also regarded as the basis of modern periodic table. in a period , the number of valence electrons increases (mostly for light metal / elements ) as we from left to right side .however, in a group this periodic trend is constant