Question

What are some examples of elements with an atomic mass greater than their atomic number?

Answer 1

Elements with an atomic mass greater than their atomic number are known as isotopes. Isotopes have different numbers of neutrons while having the same number of protons (atomic number). Here are a few examples of elements with isotopes that have an atomic mass greater than their atomic number:

1. Hydrogen:

   • Hydrogen-2 (deuterium): Atomic number = 1, Atomic mass = 2
   • Hydrogen-3 (tritium): Atomic number = 1, Atomic mass = 3

2. Helium:

   • Helium-3: Atomic number = 2, Atomic mass = 3
   • Helium-4: Atomic number = 2, Atomic mass = 4

3. Carbon:

   • Carbon-13: Atomic number = 6, Atomic mass = 13
   • Carbon-14: Atomic number = 6, Atomic mass = 14

4. Nitrogen:

   • Nitrogen-15: Atomic number = 7, Atomic mass = 15

5. Oxygen:

   • Oxygen-17: Atomic number = 8, Atomic mass = 17
   • Oxygen-18: Atomic number = 8, Atomic mass = 18

6. Uranium:

   • Uranium-235: Atomic number = 92, Atomic mass = 235
   • Uranium-238: Atomic number = 92, Atomic mass = 238

These are just a few examples, and many other elements have isotopes with atomic masses greater than their atomic numbers.