1) What is the period pattern for atoms and ions 2) What is the group pattern for atoms and ions
3) Define isoelectronic, and choose any three atoms/ions that are isoelectronic as an
example to clarify the meaning.
4) Explain how the group number is useful in determining valence configuration and
or charges of stable ions
For the first 20 elements from the periodic table

How do you lengthen a pattern piece? (family and consumer science, sewing)

How do you know when a chemical reaction has occurred

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .