Which statement is inconsistent with the concept of isotopes of the same element?
a. isotopes have the same number of protons b. isotopes have the same atomic number
c. isotopes differ in mass number
d. isotopes differ in number of neutrons present
e. isotopes differ in their nuclear charge

i'm assuming that the correct answer is indeed the first one/ "a"..

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

the answer is barium and copper bromide