1.

State any five features of modern periodic table.

Answer»
  • All the elements are arranged in the increasing order of their atomic number .
  • The horizontal rows are called periods. There are seven periods in the periodic table. 
  • The elements are placed in periods based on the number of shells in their atoms.
  • Vertical columns in the periodic table starting from top to bottom are called groups. There are 18 groups in the periodic table. 
  • Based on the physical and chemical properties of elements, they are grouped into various families.


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