None! Elements such as Kr are noble gases He, Ne, Ar, Kr, Xe, Rn, and they do not form ions.
It is an element, it can become an ion, but it is usually just an element combined with 02 after mixing with the atmosphere.
You didn't provide an ion. So since it's a positive most likely a negative ion.
N and P for example. Nitrogen will form a N3- the nitride ion.
Hydrogen is the element that can form both positive (H+) and negative (H-) ions. When hydrogen gains an electron, it forms a negative ion, and when it loses an electron, it forms a positive ion.
The element most likely to gain two electrons when it forms an ion is oxygen. Oxygen has six valence electrons and requires two additional electrons to achieve a stable electron configuration, similar to that of the noble gas neon. When it gains these two electrons, it forms a negatively charged ion known as an oxide ion (O²⁻).
If only the monopositive ions are considered, helium would create the ion with highest electronegativity.
Oxygen is the period 2 element most likely to form an ion with a charge of minus 2 because it readily gains two electrons to achieve a stable electronic configuration.
An element with a large negative electron affinity is more likely to form a negative ion because it strongly attracts electrons to achieve a stable electron configuration. This results in the formation of negatively charged ions.
Argon doesn't form any ions as it has completely filled orbitals and is chemically inert.
which element can only formed one ion
Chlorine is most likely to form the chloride ion, which has a charge of -1.
An element is most likely to form an ion when it has one or a few electrons in its outer shell, making it easier to gain or lose electrons to achieve a stable electron configuration. This is typically observed in elements at the far left or far right of the periodic table, such as alkali metals and halogens.
Oxygen is most likely to form the oxide ion (O2-) by gaining two electrons.
disappear
every element
The element most likely to form an anion is Cl (chlorine). This is because chlorine has a high electronegativity and tends to gain an electron to achieve a stable electron configuration, forming the chloride ion (Cl-).
The element with a valence electron configuration of ns2 np4 is sulfur (S). Since it needs to gain 2 electrons to achieve a stable electron configuration, it is most likely to form an ion with a charge of -2.