How many protons, electrons and neutrons are there in the following nuclei?
`(i) ""_8^(17)O " " (ii) ""_(12)^(25)Mg " " (iii) ""_(35)^(80)Br`

Explanation

To determine the number of protons, electrons, and neutrons in the given nuclei, we can use the following relationships:

1. The atomic number (Z) represents the number of protons in the nucleus.
2. In a neutral atom, the number of electrons is equal to the number of protons.
3. The mass number (A) is the sum of the number of protons and neutrons in the nucleus.

Using the formula:
\[ A = Z + N \]
...