They include the boron, carbon, nitrogen, oxygen and flourine families in addition to the noble gases. The p-block elements are found on the right side of the periodic table. The p-block elements are a very diverse group of elements with a wide range of properties. There are 35 p-block elements, all of which have valence electrons in the p orbital. The p-block is the area of the periodic table containing columns 3A to column 8A (columns 13-18), not including helium. These are so called because they form hydroxides on reaction with water which are strongly alkaline in nature. They are collectively known as the alkali metals. Group 1 of the Periodic Table consists of the elements: lithium, sodium, potassium, rubidium, caesium and francium. Why is potassium considered as an S block element? The elements in group two are called the alkaline earth metals. The elements in group one are called the alkali metals. Elements in these are in the first two periodic table groups. The electron in their most outward electron shell are in the s-orbital. Group 2 is the alkali earth metals which have two valence electrons, filling their s sublevel. They have low ionization energies which makes them very reactive. Group 1 are the alkali metals which have one valence electron. S-block elements are the elements found in Group 1 and Group 2 on the periodic table. Each block is named after its characteristic orbital thus, the blocks are: The term appears to have been first used by Charles Janet.The respective highest-energy electrons in each element in a block belong to the same atomic orbital type. A block of the periodic table of elements is a set of adjacent groups.
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