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The periodic table Typeit
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The periodic table shows elements arranged in order of in rows (called ). Elements in the same column (called a ) have similar properties because they have the same number of in their outer shell. Originally, elements were arranged in terms of , but Mendeleev noticed that this placed some elements with dissimilar properties together. He fixed this problem by changing the order of some elements, and leaving gaps for elements that had not yet been .
Elements can broadly be classed as metals, which form ions when they react, and non-metals. Non-metals are less common, and are found towards the top-right of the periodic table.