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ICSE Class 10 Answered

Explain why are the following statements not correct : (1)All groups contain metals and non-metals. (2)Atoms of elements in the same group have the same number of electron(s). (3)Non-metallic character decreases across a period with increase in atomic number. (4)Reactivity increases with atomic number in a group as well as in a period.
Asked by 137284867081767 | 14 May, 2018, 10:37: PM
answered-by-expert Expert Answer

         (i) All groups do not contain both metals and non-metals. Group I and II contain only metals.

 

         (ii) Atoms of elements in the same group have same number of valence electrons. They have same number of electrons present in their outermost shell.

 

        (iii) The non-metallic character increases across a period with increase in atomic number. This is because across the period, the size of atom decreases and the valence shell electrons are held more tightly.

 

         (iv) On moving from left to right in a period, the reactivity of elements first decreases and then increases, while in groups, chemical  reactivity of metals increases going down the group whereas reactivity of non-metals is decreases down the group.
Answered by Ramandeep | 15 May, 2018, 10:37: AM

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