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Question
Explain structure of modern periodic table in short.
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Solution
- The modern periodic table consists of seven horizontal rows called the periods and eighteen vertical columns called the groups.
- The arrangement of the periods and groups forms boxes, with each box corresponding to the position of an element.
- Atomic numbers are serially indicated in the upper part of these boxes.
- In addition to these seven rows, the lanthanide and actinide series are shown separately at the bottom of the periodic table. The first row is the lanthanide series, and the second row is the actinide series.
- There are 118 boxes in the periodic table, including the two series. vi. The entire periodic table is divided into four blocks: s-block, p-block, d-block and f-block.
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- s-block: contains group 1 and 2 elements
- p-block: contains groups 13 to 18 elements
- d-block: contains groups 3 to 12 elements (transition elements)
- f-block: contains the lanthanide and actinide series
- A zig-zag line is drawn in the p-block of the periodic table. Metals lie on the left side while nonmetals lie on the right side of this line. Metalloids lie along the border of this line.
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