manganese (II) ion: pale pink / colourless 1234 copyright protection256ＰＥＮＡＮＡQt9Rs9bbZx 尼
An element is a pure substance that cannot be broken down into anything simpler by chemical methods. 1234 copyright protection256ＰＥＮＡＮＡv5uYrFcDQa 尼
An compound is a pure substance made up by two or more element chemically combined together.1234 copyright protection256ＰＥＮＡＮＡe5ZMcLCw5h 尼
Isotopes are different atoms of the same element with the same number of protons but different number of neutrons.1234 copyright protection256ＰＥＮＡＮＡc9iCcTOlSZ 尼
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