2.8
There's a slight confusion if it is 2.8.3. well you see that is the electron arrangement of aluminium ATOM not ion.
Hope this helps!
it is 2,8,8
Na+ and neon are isoelectronic.
An ion of bromine has the electron shell arrangement of 2, 8, 18, 7. Therefore, an atom that has the same electron shell arrangement would be one that has 35 electrons, such as the element bromine itself before it becomes an ion with a charge of -1.
Argon
A chlorine ion with a stable arrangement of eight valence electrons is called a chloride ion (Cl-). It achieves this stable arrangement by gaining one electron from another atom to fill its outermost electron shell.
The electron arrangement in an ion of chlorine will be similar to argon because both chlorine (Cl) and argon (Ar) are in the same period (row) of the periodic table. Neon (Ne) is in a different period and has a different electron arrangement.
Yes, the electron arrangement in a sodium ion (Na+) is similar to neon. Both ions have a stable electron configuration with a full outer energy level (valence shell), making them inert and unreactive. Sodium loses one electron to achieve the same electron configuration as neon.
The stable ion of aluminum is Al 3+, which means it has three fewer electrons. The aluminum atom has shed its outer shell of 3s2 3p1 and has an electron configuration equal to that of Neon, or 1s2 2s2 2p6.
Electronic configuration of beryllium: 1s2.2s2.
Aluminum has trivalent cation. It is Al3+
Argon has the same electron configuration as a sodium ion. Sodium ion has lost 1 electron from its outer shell, making its electronic configuration 2, 8. Argon's electronic configuration is also 2, 8 in its outer shell.
The electron arrangement of a titanium 2+ ion (Ti^2+) would be [Ar] 3d2. This means that the ion has lost 2 electrons from its neutral state, resulting in a configuration with 2 electrons in the 3d orbital and the remaining electrons in the 4s and 4p orbitals.