⇉ Periodic Table of Elements.

In this article I will describe periodic table of elements about we saw that all the things in the world are made of incredibly tiny particles called atoms and also that there are 92 different kinds of the most things have more than one kind of atom in them but this nugget of pure gold contains only gold atoms so we call it an element an element is a substance made of only one kind of atom zooming back out we see that the gold atoms become a lump of gold again if we zoomed out from silver atoms we'd see a lump of silver instead because there are 92 kinds of atoms there must be 92 elements - one for each kind you probably have already heard of some of them like carbon iron and aluminium or aluminum if you're American but maybe not astatine or you terbium with so many elements there's a lot of names to remember fortunately there's a list showing all the elements it starts with the element with the lightest atoms hydrogen and goes to the element with the heaviest items uranium this list is called the periodic table. ⇉Periodic Table Groups.

how about grabbing your own copy now and check it as you watch the video the lightest element hydrogen is at the top left-hand side of the table each element can be written with a shorthand using one or two letters called its symbol which is capital H for hydrogen not surprisingly each element also has its own number showing its place in this list called its atomic number hydrogen is the lightest element so it's atomic number is 1 zooming into helium at the top right we can see that it's symbol is h-e-b gage fiddly to make it a bit different two hydrogen's and its atomic number is two being the second lightest element the third lightest element is lithium so it has an atomic number of three where's lithium it starts the next row this row goes up to atomic number ten before another row is started how many rows are they one two three four five six seven the periodic table has seven horizontal rows what about these rows down below called the lanthanides and actinides.