Question

d) 5 mol A + 2.5 MUI DI
(3)
79
35 Br and 79Br can be written whereas symbols 3579 Br and 3Br are not acceptable. AllsWLI
28) Symbols
briefly.
(3)
the canonical forms.​

Answer 1

Answer:

For a given element, the number of protons is the same for the isotopes, whereas the mass number can be different for the given atomic number.

Hence, the mass number should be written necessarily.