8 - called valence electrons. it doesn't matter what energy level or orbital shape. a "happy atom" has 8 valence electrons
An atom wants 8 valence electrons. It is sometimes referred to as "the magic 8" in chemistry. Except for hydrogen, which wants 2.
8 electrons.
The outer shell is the valence electrons and they are very loosely bound to the nucleus - less force by the nucleus on the valence electrons, so valence shell's electrons are exchanged first in any reaction.Valence
Krypton is a noble gas and has a particularly stable electronic configuration. That's why it may be very unreactive.
If the element has a full valence shell, such as the noble gases, then it is unreactive. It the element is missing few valence electrons of has few valence electrons, then the element is very reactive, such as the sodium.
Valence shells mean that the outermost orbits of electrons are full. Recall that from the inside out, the number of electrons for a shell to be full are: 2, 8, 8, 8, etc... So, Helium, He (2) has a filled shell. Neon (10) has a filled inner shell (2) and a filled outer shell (8): 2 + 8 = 10. Argon (18) has a filled inner shell (2), another filled shell (8), and a valent shell (8): 2 + 8 + 8 = 18. The family is composed of the non-reative Noble Gases.
Beryllium would tend to lose its two electrons when forming a bond because it is easier to lose its two valence electrons rather than gain an additional five in order to obtain a full outer shell.
Magnesium needs to gain two more electrons to have a full outer valence shell. This would give it a stable octet like the nearest noble gas, neon.
the electrons on their outer shell, all atoms want to gain a full valence shell.
Each atom is left with a full outer shell of electrons, which makes them stable and less likely to form bonds with other atoms.
Argon has eight valence (outer) shell electrons. It is a Noble Gas so its valence shell is full (Octet Rule).
In general, atoms need 8 valence electrons to achieve a full outer shell (except for hydrogen and helium, which need only 2). This is known as the octet rule. Atoms can achieve a full outer shell by gaining, losing, or sharing electrons through bonding.
The outer shell of xenon is full with 8 electrons.
7
There are three valance electrons. These are the electrons in the outer shell if it is not full.
A full outer ring, or valence shell, has 8 electrons, except for helium, which has 2 electrons.
The most common term for a completed outer shell of electrons is that is or has "full" valence electrons.
The outer shell is the valence electrons and they are very loosely bound to the nucleus - less force by the nucleus on the valence electrons, so valence shell's electrons are exchanged first in any reaction.Valence
It's outer valence shell is full.