I need help Which of the atoms in the problem above are isotopes of the same element? How did you determine this?

d and e - Sodium and antimony

Explanation:

The atomic numbers remain the same, while the mass numbers change (because neutrons are being added or taken away).

sodium has an atomic number of 19 and a mass number of 39 - in d, it has an atomic number of 19 but a mass number of 40. therefore, it is an isotope

antimony has an atomic number of 51 and a mass number of 121.60 - in e, it has an atomic number of 51, but a mass number of 123. therefore, it is an isotope

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

im not exactly sure but i think its b!