Question

an element is placed in 5th row and 3 group has what atomic number​

Answer 1

Answer:

In the current IUPAC group numbering system, there is NO such element. In the old system Roman numerals were used, and in group V 3rd period is Phosphorus, atomic number 15. Those coordinates correspond to element number 23, Vanadium(V), and it's atomic mass is about 50.9415 AMU(Atomic Mass Units).