Final answer:
Isotopes are atoms of the same element that have different numbers of neutrons. In this question, options a) 80 Br and c) 79Br are isotopes of bromine.
Step-by-step explanation:
In this question, the isotopes are represented by the different forms of the element bromine (Br). Isotopes are atoms of the same element that have different numbers of neutrons. So, to determine which of the options are isotopes, we need to identify the ones that have the same number of protons (atomic number) but different numbers of neutrons.
a) 80 Br: This is an isotope of bromine with an atomic mass of 80.
b) 80Br-1: This is also an isotope of bromine, but it has an extra negatively charged particle (anion).
c) 79Br: This is the most common isotope of bromine with an atomic mass of 79.
d) 80Se: This is not an isotope of bromine. It is an element called selenium with an atomic mass of 80. It has a different number of protons and neutrons compared to bromine.
So, the correct answer is option a) 80 Br and option c) 79Br.