Number of elements in 4th period
- Number of elements present in 4th period
- Total number of elements in 4th period
- Maximum number of elements in 4th period
- The number of elements in 4th period of periodic table is
- Maximum possible number of elements present in 4th period
- Maximum number of elements in period 3rd and 4th
- The number of elements present in 2nd 3rd 4th 5th period are
- Elements of periodic table