WebPeriodic table is divided into four block and they are S block , P block, d block and F block. S-Block elements-Group 1 elements- H , Li , Na , K , Rb , Cs , Fr; LiNa ne Ki Ruby Cse … WebThe Modern Periodic Table has 18 vertical columns known as ‘groups’ and 7 horizontal rows known as ‘periods’. Let us see what decides the placing of an element in a certain group and period. K Shell – 2 × (1)2 = 2, hence the first period has 2 elements. L Shell – 2 × (2)2 = 8, hence the second period has 8 elements.
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