Interpretation:
The group which is also called as coinage group needs to be determined. The element which is used from this group in many U. S. coins needs to be determined.
Concept introduction:
Group 11 is also termed as the coinage group. It is because this group contains metals which are used for making coins such as copper, silver, gold and roentgenium.
Answer to Problem 51A
Group 11 is called the coinage group. Copper is still used in many U. S. coins today.
Explanation of Solution
The element Copper, Silver, Gold and roentgenium in group 11 are used for making coins. Copper is one of the most important elements used currently for production of coins in US. Copper is found in pennies, dimes, nickels, quarters etc.
Coinage group is referred to Group 11 in the periodic tables. US coins are produced by using the Copper metal
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