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Question

From the following elementA1939,B1428,C816,D1840, which elements belong to the same period?


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Solution

Periods in the periodic table:

  1. Periods are the horizontal rows of elements with similar properties on the periodic table.
  2. Along the periodic table, they are numbered 1 to 7, moving from left to right.
  3. Elements belonging to the same period have the same valence shell.
  4. Element B1428has an atomic number=14 with an electronic configuration1s22s22p63s23p2.
  5. Element D1840 has an atomic number=18 with an electronic configuration1s22s22p63s23p6.
  6. Element B1428 represents silicon and element D1840 represents Argon.
  7. Both these element belongs to the 3rdperiod of the periodic table.

Therefore, From the given elements B1428 and D1840 belongs to the same period.


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