Name: Metallic solids
Uploaded: 2020-03-27T17:37:38.000Z
Duration: 5 min 21 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Some of you might be guessing maybe this is some type

It actually turns out that this is sodium.

Our same friend sodium that we saw bonding with chlorine

to form sodium chloride and form ionic solids,

it can actually bond with itself with metallic bonds.

Isn't calcium kind of this chalky white powder?

Well no, those are compounds formed with calcium,

But this right over here is pure calcium.

And the reason why it has to be in this container,

So that's not oxygen that is in this container.

with metallic bonds, which we'll talk about in a little bit,

It's this shiny, metallic, or lustrous look to it.

Well this is something we're used to associating

But once again, you can see it has this lustrous property.

So what is it about metals or metallic solids

that allow them to be lustrous in this way

and have other properties that we're about to see?

And to understand that, we just have to look at

And that most of the periodic table of elements

You have in red right over here, this group one elements,

your post-transition metals, your metalloids.

It's really only what you see in yellow and blue here

So how do metals form solids when you just have

Well the general idea, you can look at your alkali metals,

it's much easier for them to give away a valence electron.

And that's why we often see these folks are dissipating

They too can be ionized or if you have a pure sample

like in a calcium, they can contribute two valence electrons

And the transition metals here have a similar ability

And so in general, we can view metallic solids

as having cations, these positively charged cations

I'll just draw all these minus charges that they're in.

Well if you're looking at the alkali metals,

each of those atoms could give one electron to that sea

because it doesn't really want that valence electron.

If you're talking about alkaline earth metals,

they could each donate two electrons to that sea.

Now given that you have this positive charge

And many of you might guessed, if you looked at a wire,

wires are made out of metals, because they are excellent

at conducting electricity, or they tend to be excellent

at conducting electricity, because you have

all of these electrons that can move around.

And so if you apply a voltage, they will start moving

And those electrons can also be good at conducting

Now what would be, we already talked about them

As soon as you try to shift them around a little bit,

But what do you think is going to happen here?

If let's say right over here, I were to push really hard

Subtitles ListPlay Video

Metallic solids

stick

realize

positive

associate