Question

What is the need of arrangement of elements
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Answer 1

Answer:

The periodic table has gone through many changes since Dmitri Mendeleev drew up its original design in 1869, yet both the first table and the modern periodic table are important for the same reason: The periodic table organizes elements according to similar properties so you can tell the characteristics of an element just by looking at its location on the table.

Elements in the same row as one other are known as periods and they share the same highest unexcited electron energy level.