How many elements are there in period 4? (2024)

The period in the periodic table:

See Also
The Fire TriangleNaming the ElementsPlato’s Cosmology: The TimaeusOxygen | Discovery, Symbol, Properties, Uses, & Facts

  1. The elements in the horizontal rows of a periodic table represent periods.
  2. The 4th-period elements are the elements in the 4th row of the periodic table.

The number of elements in a period can be determined as:

Let 'p' be the period number, and

See Also
Greek Color Theory and the Four Elements [full text, not including figures]

  1. If p is even, the number of elements is: p+222
  2. If p is odd, the number of elements is: p+122

Since period number is 4, it is even.

Therefore, number of elements in period 4 will be

4+222=362=18

Hence, there are 18 elements in period 4 of the periodic table.


How many elements are there in period 4? (2024)
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