No, numberatom and atomnumber are not the same. The order of the number and the element symbol is significant and represents different information.
In the case of 10Na, the number 10 represents the atomic mass or mass number of the atom, which is the total number of protons and neutrons in the nucleus of an atom. The element symbol "Na" represents the chemical symbol for sodium.
On the other hand, Na10 indicates that there are 10 atoms of sodium (Na).
Therefore, 10Na refers to a single atom of sodium with an atomic mass of 10, while Na10 represents a collection of 10 sodium atoms.