The electronic configuration of an element is 2, 8, 8. It belongs to group

Explanation

Concept: A periodic table is an arrangement of elements based on their atomic numbers and chemical properties . It is divided into 18 groups and 7 periods running vertically and horizontally respectively. The periodic table accommodates a discrete combination of metal, non- metals, and metalloids . The elements in the periodic table are arranged horizontally in ascending order of their atomic numbers known as periods. Vertically the elements having identical chemical properties are clubbed together known as groups. The 18 groups are also known as columns and the 7 periods are also known as the rows . Explanation: Periods: Elements are arranged in increasing the atomic number of elements in a period . One extra electron gets added to the outermost shell as we move along the periods from left to right. The electron gets added to the same shell or orbit and thus the electrons present for bonding increase by one unit. Thus, the shell number remains the same but the number of electrons present for bonding increases along a period. Groups: Elements having the same number of outer electrons are put in the same group of the periodic table. When we move down a group, one extra shell gets added to the elements. The outermost shell has electrons present for bonding . Though the number of shells increases as we go down in a group , the number of electrons in the outermost shell remains the same. For example, the Halogens F, Cl, Br, I, and At all belong to group 17 and have 7 electrons in the outermost shell. Similarly, Group 16 elements have 6 electrons in the outermost shell, group 15 has 5 electrons in the outermost shell, and so on. Group Number Common name Number of electrons for bonding 8 Iron family 6 16 Chalcogens 6 17 Halogens 7 18 Noble Gas 8 So, the electronic configuration of an element is 2, 8, 8 . It belongs to group 18 .