An (mono atomic) ion is called isoelectronic with another element (or ion) when it has the same number of electrons with it. (they are in the same period or it is the preceeding noble gas).
Examples:
Nitride (of Nitrogen), Arsenide (of Arsenic), Antimonide (of Antimony), Bismuthide (of Bismuth) and Boride (of Boron)
C-4 N-3 O-2 F- Ne Na+ Mg+2
Hydroxide and water are isoelectronic with fluoride as they have the same number of electrons.
Krypton, calcium, chlorine+1 are isoelectronic with argon because they all have the same number of electrons, 18.
Atoms are isoelectronic when they have the same electron configuration. Therefore, an anion isoelectronic to krypton is bromide. A cation isoelectronic to krypton is rubidium.
Nothing's wrong, except that it means elements X and Y are in fact the same element, if their atoms have the same number of electrons. --------- A more clear, correct and short answer: a neutral atom of an element can be isoelectronic only with an ionized atom of another element.
The statement is incorrect because isoelectronic means having the same number of electrons, but atoms of different elements have different numbers of protons and electrons. Elements X and Y can have the same number of electrons in their ions, but not in their neutral atoms.
None. However, the noble gas helium is isoelectronic with Li+ ion (and not with Li element)
An atom is isoelectronic with another if they have the same number of electrons. The neutral atom that is isoelectronic with F (9 electrons) is Ne (neon). For Ca²⁺ (20 electrons), the isoelectronic atom is Ar (argon). P³⁻ (18 electrons) is isoelectronic with Ar as well, while K⁺ (18 electrons) is also isoelectronic with Ar. Pb²⁺ (78 electrons) is isoelectronic with the neutral atom Xe (xenon).
Potassium (K) is not isoelectronic with any other element in its neutral state. However, when it loses one electron to form a potassium ion (K⁺), it becomes isoelectronic with argon (Ar), as both have the same electron configuration of 18 electrons. Isoelectronic species have the same number of electrons and similar electronic structures, which in this case occurs when K loses an electron.
The usual substance isoelectronic with carbon monoxide used for comparison is the simple substance dinitrogen gas. Dinitrogen gas is the familiar simple substance form of the element nitrogen.There is a compound of nitrogen, though, that is isoelectronic with carbon monoxide: hydrogen cyanide HCN.
Isotopes are not considered isoelectronic species. Isotopes have different numbers of neutrons, while isoelectronic species have the same number of electrons. Isotopes of an element have the same number of protons but different numbers of neutrons.
Nitride (of Nitrogen), Arsenide (of Arsenic), Antimonide (of Antimony), Bismuthide (of Bismuth) and Boride (of Boron)
C-4 N-3 O-2 F- Ne Na+ Mg+2
Magnesium element has no relation with noble gas. But Mg2+ ions and noble gas neon are isoelectronic.
Neon is isoelectronic with the sodium ion.
Argon is isoelectronic with the sulfide ion.