Hello! In the textbook , the nucleon number is at the top & the proton number is at the bottom. However its the opposite way in the periodic table. Does it matter where the proton & neutron numbers are place at?

For the sake of knowledge and to avoid ambiguity, YES it does matter.

Explanation:

Proper representation of the mass number and atomic number of chemical elements is key or important. The periodic table is the standard arrangement of chemical elements by atomic number, electronic configuration and chemical properties in a tabular form.

Furthermore as a rule, it should be noted that the mass number (nucleon number) is always larger than the atomic number(number of proton)