Which element has an atomic mass of 106.42?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

What is the chemical name of the compound na2co3? use the list of polyatomic ions and the periodic table to you answer. a. sodium carbon oxide b. sodium carbonate c. sodium(ll) carbonate d. sodium oxalate

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?