devarshi-dt-logo

Question:

The periodic table has 18 groups and 7 columns. An isotope of copper, on bombardment with protons, undergoes a nuclear reaction yielding element X as shown below. The group number of element X is: 6329Cu+11H→610n+α+211H+X7865

8

7

6

5

Solution:

6329Cu+11H→610n+42He+211H+AZX
The mass number on the left side is 63+1=64. The mass number on the right side is 6+4+2+A=A+12. Therefore, A+12=64 which means A=52.
The atomic number on the left side is 29+1=30. The atomic number on the right side is 2+2+Z=Z+4. Therefore, Z+4=30 which means Z=26.
The element with atomic number 26 is Iron (Fe). The electronic configuration of Fe is [Ar]3d64s2. Thus, Fe belongs to group 8.