Elements in the same group have similar properties because they

Physics

1 answer:

MA_775_DIABLO [31]3 years ago

4 0

Answer: A. need the same number of electrons to fill their valence shells

B. have the same number of valence electrons

Explanation:

Elements are distributed in groups and periods in a periodic table.

Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.

Example: Flourine, chlorine and bromine are elements which belong to Group 17. They have 9, 17 and 35 electrons respectively and contain 7 valence electrons each and need one electron to complete their octet.

The chemical reactivity of elements is governed by the valence electrons present in the element.

$F:9:1s^22s^22p^5$

$Cl:17:1s^22s^22p^63s^23p^5$

$Br:35:1s^22s^22p^63s^23p^63d^{10}4s^24p^5$

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