## Energy Levels of Electrons

### Valence electrons and bonding (video) Khan Academy

I can see that I would fill 3s so 3s3. And so chlorine gains an electron. How many electrons does aluminum gain to form an ion? The effect also explains atomic size. This effect, called the shielding effect, describes the decrease in attraction between an electron and the nucleus in any atom with more than one electron shell. It's one, two, three, four, five, six. If a neutral atom of chlorine picks up an electron, well, the electron would add right in here.

If it is in the second energy level, it must have And so for this video, we're only talking about the valence electrons for elements in the main groups. From that point on, however, the electron affinities decrease as we continue down these columns. Furthermore, the electron being removed when the first ionization energy is measured spends less of its time near the nucleus of the atom, and it therefore takes less energy to remove this electron from the atom.

Therefore, these electrons are not as strongly bound as electrons closer to the nucleus. These data can be explained by noting that electron affinities are much smaller than ionization energies.

How many electrons does radium gain or lose in forming an ion?

## When selenium becomes an ion, how many electrons does it gain or lose?

An anion a negatively charged ion is formed from the gain of an electron, and a cation a positively charged ion is formed from the loss of an electron. Well I use a short hand where we could say, well it's base configuration is the same as neon. Now what about the other group one elements? Well those are these D electrons right over here. Cations are positively charged ions formed by losing electrons. That's in a shell that hasn't been stabilized.

As you may remember from chemistry, an atom consists of electrons orbiting around a nucleus. Electrons can jump from one energy level to another, but they can never have orbits with energies other than the allowed energy levels.

### Energy Levels in Atoms

The sodium cation is stable. How many electrons does alumiunum gain or lose?

It's a little bit harder to predict. Note that many carbides with other metals are not ionic such as tungsten carbide sometimes used to make jewellery such as rings. Metals usually tend to lose as nonmetals gain electrons. Would you like to make it the primary and merge this question into it?

### How many electrons does selenium gain or lose

Would you expect Indium to gain or lose electrons when forming ions? As it is in group six and therefore nearer to the Noble Gases it gains. I encourage you to pause this video and based on what we've just talked about, think about how many Valence electrons carbon has and what its Lewis dot structure could look like. Choose a video to embed. OIL RIG is most commonly used to help remember that oxidation … is loss and reduction is gain of electons.