مصادر الكيمياء موقع لتعليم الكيمياء بصورة مبسطة
Four blocks of elements in the periodic table. 1 – s block elements. Elements of groups 1 and 2 each possessing one and two electrons respectively in the s orbital of their outermost orbits are together known as s block elements. Example : Na: 1s2 2s2 2p6 3s1 Mg: 1s2 2s2 2p6 3s2 Characteristics of s block elements. a -They …
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