the one with 81 as the smaller number.... if there isen't one, then you've got your calculations wrong...
No . all the atoms have same no of protones.....
6
6
Element 81 is thallium.
This chemical element is krypton.
Neutral or no charge.
Thallium. Atomic number (Z) = 81
Because it got the highest amount of protones.
The number of protons in a nucleus is called the Atomic Number.
Thallium is a meta element. Atomic number of it is 81.
In the same way as other materials - combination between protones neutrons and electrones
one more proton, and electron