- An element's number of protons plus neutrons make up its ________ number.
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Ionic compounds such as sodium chloride may form
- In a ________ bond the atoms have different electronegativities and share the electrons unequally.
- The four most common elements of living matter include the following EXCEPT:
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The attraction between the partial positive charge on the hydrogen atom of water and the partial negative charge on the nitrogen atom of ammonia is
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What is the atomic number of the cation formed in the reaction at right?
- The 2nd and 3rd electron shells can contain up to ________ and ________ electrons, respectively.