like chlorine gas, as elements. But these are very different from the isolated atoms depicted on the periodic table. That’s why some chemists think we should make a distinction between the ...

The periodic table The periodic table is a chart of ... The three common Group 7 elements are chlorine, bromine and iodine. The word ‘halogen’ means 'salt former'. Group 0 and testing ions ...

These are almost one-quarter of the periodic table ... are essential elements that our bodies need in larger amounts: oxygen, carbon, hydrogen, nitrogen, phosphorus, sulphur, chlorine, potassium ...

There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...