Elements below and above each other belongs to same group.
- According to the Modern Periodic Law, the elements in the periodic table are organised in that order.
- It claims that the atomic numbers of the elements are periodic functions of their physical and chemical qualities.
- The quantity of valence electrons in an atom determines its physical and chemical properties.
- The number of electrons in an element's valence shell, which is its outermost shell, is also indicated by the element's group number.
- The great majority of the physical properties, chemical properties, and reactivities of the elements are caused by these valence electrons.
- The group's elements share a number of chemical characteristics. This is due to the fact that both of their atoms' highest occupied energy levels have an equal number of electrons.
- For example, Li, NA, K, and Cs all have one valence electron. They share characteristics as a result.
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