A chemist weighed out 66.5g of tungsten. Calculate the number of moles of tungsten she weighed out. Be sure your answer has the correct number of significant digits.

Can someone me with 1 to 4 plz. fast

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

What is the chemical name of the compound ti2o3? use the list of polyatomic ions and the periodic table to you answer.