Element with atomic number 15 and mass number 31 is present in
The mass number and atomic number of an element is 23 and 11 respectively. What is the number of nucleons present in it?
Atomic mass of an element is equal to the total number of __________ present in an atom of that element.
An element has atomic number 19 and mass number 39. How many electrons and protons are present in its unipositive ion?