![]() The f-block consists of two series of lanthanoids. In p-block elements, the valance electrons enter in p orbital and group-XIIIA to XVIIIA belongs to these elements. Group-IIIA to group-XIIA belongs to this group. The valance electrons enter in d orbitals for d-block elements. d-block elements are transition elements except for zinc, cadmium, mercury. Group-IA and group-IIA belong to this block in the periodic table. In s-block elements, valance electrons enter an s-orbital. Reactivity of metals increases down the group.Ģ FAQs about Periodic Table Elements Type of Elementsĭepending upon the type of orbital receiving the valance electron the elements are classified into four blocks such as s-block, p-block, d-block, f-block. Similarly, all the elements of a group of the periodic table have the same number of valance electrons hence have similar chemical properties. The number of valance electrons increases from one to eight on moving from left to right in a period.įrom left to right in a period atomic size, electropositive nature, metallic nature, basic nature of oxides all decreases, and electronegative nature, non-metallic nature, acidic nature of oxides all increases. In each period a new electronic shield gets filled. In the periodic table elements of a group possess similar chemical properties. There are eighteen groups and seven periods in the modern periodic table. In the periodic table of elements, the horizontal rows are called periods and the vertical columns are called groups. It is also the most convenient and widely used periodic table. The modern periodic table is the long form of the periodic table elements and it is based on the electronic configuration of elements.
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