The correct answer is Option (2) → Isotones
Atoms of different elements that have the same number of neutrons but a different number of protons (and therefore different atomic numbers) are called Isotones.
Understanding the Options
To distinguish between these terms, it is helpful to look at their definitions:
- Isotones: Atoms of different elements with the same neutron number ($N$) but different atomic numbers ($Z$).
- Example: Carbon-14 ($^{14}_{6}\text{C}$) and Nitrogen-15 ($^{15}_{7}\text{N}$) both have 8 neutrons.
- Isotopes: Atoms of the same element (same number of protons) that have different numbers of neutrons.
- Example: Protium, Deuterium, and Tritium are all isotopes of Hydrogen.
- Isobars: Atoms of different elements that have the same mass number (sum of protons and neutrons) but different atomic numbers.
- Example: Argon-40 ($^{40}_{18}\text{Ar}$) and Calcium-40 ($^{40}_{20}\text{Ca}$).
- Isoelectronic: Species (atoms, ions, or molecules) that have the same number of electrons.
- Example: $Na^+$, $Mg^{2+}$, and $Ne$ all have 10 electrons.
|
