Identify three elements and tree compounds. How are they similar? How are they different?
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Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions. ... Compounds are represented by their chemical formula. For example, salt is represented by the formula NaCl.
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Before checking the differences between compounds and elements, it is crucial to know what they are and to learn about their in-depth concepts. Visit Elements And Compounds to learn all the underlying concepts in a more detailed and easy way.
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Dobereiner observed in a few atoms that the mass of one atom is equal to the average of two atoms. He defined almost all properties basing on atomic weight. Hence, this is called Dobereiner triad.
Lithium has 7, sodium has 23 whereas potassium has 39 as atomic masses.
23=(7+39)/2=23
Here, we could observe that atomic mass of sodium is the average of atomic masses of potassium and lithium.