The periodic table lists the elements in order of increasing atomic number. This has been also the number of protons in each atom. The first 20 items are listed in the following order: H stands for hydrogen
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Lithium, Beryllium, Sodium, Magnesium, Aluminium, Potassium, and Calcium are metals in the first twenty elements. Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Phosphorous, Sulphur, Chlorine, and Argon are the non-metals in the first twenty elements.