Respuesta :

Answer:

2.in columns

Explanation:

  • The elements of the periodic table is distribute as in 7 periods and 18 groups. The element is distribute on base on increasing atomic number.
  • The period is called horizontal row and the group is called vertical column.  
  • in periodic number of sphere around the nucleus remain the same, but as we move from left to right, the valence electrons continue to increase.
  • so correct option is 2.in columns

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