Answer:
35 p+, 45 n, 36 e-
Step-by-step explanation:
The number '35' to the left of 'Br', represents the atomic number of the element. The number of protons is equal to the atomic number. Therefore the number of protons is 35.
The number '80' to the left of 'Br' represents the mass number of the element. The number of neutrons is equal to the mass number minus the number of protons.
80 - 35 = 45
Therefore the number of neutrons is 45.
The number '35' to the left of 'Br', represents the atomic number of the element. The number of electrons in an atom with no charge is equal to the atomic number. However, this atom is not neutral. The '-' to the right of 'Br' means it is a negatively charged atom (anion), with a charge of -1. So to find the number of neutrons add 1 to to the atomic number.
35 + 1 = 36