Which of the following species are Isoelectronic with Ne? Choose one or more: LI Mg2+ A13 F Са Na E LI
The Correct Answer and Explanation is:
To determine which of the listed species are isoelectronic with neon (Ne), we need to first understand the concept of isoelectronic species. Isoelectronic species are atoms or ions that have the same number of electrons.
Neon (Ne):
Neon is a noble gas with an atomic number of 10. This means that a neutral neon atom has 10 electrons. So, we need to identify which of the given species also have 10 electrons.
Analyzing each species:
- Li (Lithium):
- The atomic number of lithium (Li) is 3, which means a neutral lithium atom has 3 electrons. However, Li often loses an electron to form a Li⁺ ion, which would then have 2 electrons.
- Li is not isoelectronic with Ne.
- Mg²⁺ (Magnesium ion):
- Magnesium (Mg) has an atomic number of 12, meaning a neutral Mg atom has 12 electrons. When Mg loses two electrons to form Mg²⁺, it has 10 electrons, which is the same as neon.
- Mg²⁺ is isoelectronic with Ne.
- Al³⁺ (Aluminum ion):
- Aluminum (Al) has an atomic number of 13, meaning a neutral Al atom has 13 electrons. When Al loses three electrons to form Al³⁺, it also has 10 electrons.
- Al³⁺ is isoelectronic with Ne.
- F (Fluorine):
- Fluorine (F) has an atomic number of 9, so a neutral fluorine atom has 9 electrons. Fluorine typically gains one electron to form an F⁻ ion, which would have 10 electrons, the same as neon.
- F⁻ is isoelectronic with Ne.
- Ca (Calcium):
- Calcium (Ca) has an atomic number of 20, so a neutral calcium atom has 20 electrons. Calcium typically loses two electrons to form Ca²⁺, which has 18 electrons.
- Ca²⁺ is not isoelectronic with Ne.
- Na (Sodium):
- Sodium (Na) has an atomic number of 11, meaning a neutral sodium atom has 11 electrons. Sodium typically loses one electron to form Na⁺, which has 10 electrons.
- Na⁺ is isoelectronic with Ne.
Conclusion:
The species that are isoelectronic with neon (Ne) are Mg²⁺, Al³⁺, F⁻, and Na⁺. These species all have 10 electrons, matching the electron configuration of neon.