Different atoms of neon can be represented as 1020Ne{}^{20}_{10}\text{Ne}1020Ne and 1022Ne{}^{22}_{10}\text{Ne}1022Ne.
Complete the sentences below using the correct words or phrases from the list:
These atoms of neon are called (i) ________ because their (ii) ________ are the same, but their (iii) ________ are different.