Portraiture was important to:

What is Hagia Sophia? Who built it? Why is it important as an architectural achievement? 

The Great Pyramids at Giza were built for:

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The correct name for NiSO4·7H2O is

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 Boron obtained from borax deposits in Death Valley consists of two isotopes.  They are boron-10, with atomic mass of 10.013 amu and  19.9 % abundance, and boron-11 with atomic mass 11.009 amu, and 80.1 % abundance, respectively. The atomic mass of boron is:

The formula for calcium phosphite is

Which of the following pairs of elements would be most likely to form an ionic compound?