Now finally, we’re going to talk about the
different phases that exist in the periodic
table.
When I say phases, I mean solid, liquid or
gas.
We’re going to say at room temperature and
now room temperature is really a range, okay?
Most people agree that room temperature is
around 21 to 22 to 23 degrees Celsius.
To be safe, a majority of the world will say
that room temperature is anywhere between
20°C to 25°C.
We’re going to say at room temperature,
almost all the elements you find on the periodic
table will be solids.
And, just so you can see everything I’m
writing, I’m going to take myself out of
the picture guys.
Just remember, at room temperature all elements
are solids except for a few.
Here we’re going to say that mercury, now,
mercury is - let me erase all of this right
here - mercury is Hg which is right here,
and bromine, which is right here, Br.
These two elements don’t exist as solids
at room temperature; instead, they exist as
liquid.
Just think of the mercury in a thermometer.
Mercury is a liquid.
And, now we’re going to say hydrogen which
is right here.
Hydrogen, nitrogen, oxygen, fluorine, chlorine
and the noble gases—these guys here.
These guys don’t exist as solids either.
They exist as gases at room temperature.
Just to give you a quick overview of what
the periodic table is, who came up with the
term, who do we owe this to, the classifications
and subdivisions of each group, if you can
understand this, it will make you a lot easier
when it comes to memorizing and understand
why reactions happen the way they do.
