Non-metals react together to form ____ which are held together by ____ bonds. These hold the atoms together very ____. If these substances are made of simple molecules, they have low ____ points and boiling points. So at room temperature they often exist as ____ and liquids or as ____ which melt relatively easily. This is because there are ____ ____ forces between molecules, which require very little heat energy to be ____.

Covalent molecules

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