So you know what an atom is now... at least if you went from page to page from left to right (though I wouldn't so I don't blame you if you didn't, however if you don't happen to know what atoms are then learning is advisable).
Anyways, in short, molecules are atoms that have bonded to create compounds (for more information on compounds, see "Compounds vs. Mixtures") that are different than the pure atoms, sometimes completely changing the "personality" of an atom. Molecules are formed to fill the outer (or valence shell) of an atom by combining with other elements who also need electrons.
I know the below video is excruciatingly cheesy and odd, but it does have some good information in it. If you really don't want to watch the video, beneath it is the information you missed.
Anyways, in short, molecules are atoms that have bonded to create compounds (for more information on compounds, see "Compounds vs. Mixtures") that are different than the pure atoms, sometimes completely changing the "personality" of an atom. Molecules are formed to fill the outer (or valence shell) of an atom by combining with other elements who also need electrons.
I know the below video is excruciatingly cheesy and odd, but it does have some good information in it. If you really don't want to watch the video, beneath it is the information you missed.
Every atom has electrons, in shells. Each shell can hold a certain number of electrons before it is filled (the first holds two, the second eight, the fourth eighteen, the fifth thirty two, and so on; there are subshells too, but those will be discussed in an article hopefully coming soon), and no atom is content until it has a full shell of electrons (though some are more persistent than others in getting a full shell, as the only atoms that are perfectly content are the noble gasses). To get these shells full they combine to share electrons. The example given in the video is that oxygen (8) has six electrons in their valence shell (two it's first shell and six in it second) and it wants eight. Hydrogen has only one electron and wants fill it's first shell for one more. When two hydrogen molecules and one oxygen atoms meet, they combine to meet the needs of both. This compound is now H20 (the 2 should be sub-scripted). Or water. Yum. The video's discription is better. Oh whatever.