As early chemists worked to purify ores and discovered more elements, they realized that various elements could be grouped together by their similar chemical behaviors.
What is elements?
- A chemical element is a substance that cannot be broken down by chemical means. Although elements aren't changed by chemical reactions, new elements may be formed by nuclear reactions.
- Elements are defined by the number of protons they possess. Atoms of an element all have the same number of protons, but they can have different numbers of electrons and neutrons. Changing the ratio of electrons to protons creates ions, while changing the number of neutrons form isotopes.
- There are 118 known elements. Research is underway to make element 120.1 When element 120 is made and verified, the periodic table will need to be changed to accommodate it!
To learn more about isotopes refer to:
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